@article{2-s2.0-85205686436,

title = {Mimetite and polymineralic mimetite-pyromorphite-vanadinite single crystals from the Sowie Mts, Poland},

author = { E. Szełęg and J. Janeczek and R. Juroszek and M. Danila},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85205686436&doi=10.2478%2fmipo-2024-0005&partnerID=40&md5=8f85f612fcfd782bdca59247eca72cad},

doi = {10.2478/mipo-2024-0005},

issn = {18998291},

year  = {2024},

date = {2024-01-01},

journal = {Mineralogia},

volume = {55},

number = {1},

pages = {48-59},

publisher = {Sciendo},

abstract = {Millimeter-sized crystals of mimetite and pyromorphite, and polymineralic mimetite-pyromorphite-vanadinite crystals occur in quartz-baryte vein within paragneisses of the Sowie Mts, SW Poland. Three morphologically different mimetite crystals and a polymineralic crystal were examined by electron probe micro-analysis (EPMA), back-scattered electrons (BSE) imaging, Raman microspectroscopy, and X-ray composition mapping. Mimetite occurs as well-developed crystals, crystals built up of sub-parallel individuals due to autoepitaxial growth, and crystals extensively etched. All of the mimetite crystals are zoned with respect to pyromorphite molecule content with sharp increase up to 23 mol% in the outermost zones. The apparent vanadinite crystal actually consists of oscillatory-zoned pyromorphite + minor vanadinite core, intermediate zones composed of pyromorphite, two mimetite zones intercalated by a band of oscillatory pyromorphite and minor vanadinite, and vanadinite mantle. EPMA data show a limited miscibility between all three minerals in the polymineralic crystal. Most analyzes cluster around 10 mol% of ternary solid solution with the maximum value of ca. 30 mol%. X-ray elemental maps reveal sharp boundaries between compositionally contrasting zones in the crystal core. In mimetite zones, the substitution of As by P does not exceed 0.43 atoms per formula unit (apfu). In the vanadinite mantle, As + P does not exceed 0.30 apfu. The distribution of Pb is uniform throughout the crystal with the highest Ca/Pb ratio of 0.03. The observed sequence of crystallization in the polymineralic crystal can be explained by the relative changes in ions concentrations at the crystal/solution interface, i.e. within the diffusion boundary layer, in accord with the models of the autocatalytic crystal growth. The authors hypothesize that kinetically driven fast growth of the polymineralic crystals resulted in precipitation of discrete mineral phases with very limited anionic substitutions. © 2024 Eligiusz Szełȩg et al., published by Sciendo.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85182728897,

title = {Phyllite/bentonite mixture-an alternative effective buffer material for a geological disposal of radioactive waste},

author = { J. Kyzioł-Komosińska and J. Janeczek and A. Dzieniszewska and M.J. Fabiańska and A. Matuszewska and E. Teper and E. Szram and T. Krzykawski and M. Pająk and J. Czupioł},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85182728897&doi=10.1007%2fs11356-023-31102-6&partnerID=40&md5=170ca50532c1099a2d251dd0307aca0c},

doi = {10.1007/s11356-023-31102-6},

issn = {16147499},

year  = {2024},

date = {2024-01-01},

journal = {Environmental science and pollution research international},

volume = {31},

number = {2},

pages = {2419-2436},

abstract = {The use of phyllite (Phy) instead of quartz in mixtures with bentonite (B) is recommended as a buffer material for engineering barriers in a geological repository of nuclear waste. The recommendation is based on experimentally determined sorption properties of various Phy/B mixtures. The adsorption capacity of Phy/B mixtures (Phy/B: 75/25; 50/50; and 25/75), the removal efficacy of Eu(III) ions (an analog for fissiongenic lanthanides and actinides), and the rate of their binding reaction were studied using the batch adsorption equilibrium and kinetic experiments at different Eu(III) initial concentrations, solution pH, and solution to adsorbent (L/S) ratio. The adsorption capacity of the Phy/B mixtures increased with the increased bentonite content in the mixture depending on the L/S ratio and solution pH. The highest increase in the adsorption capacity of the Phy/B mixtures compared to phyllite was observed for the Phy/B proportions of 25/75 and 50/50. The rate of the Eu(III) adsorption was the best fitted by the pseudo-second-order kinetic model indicating that the adsorption rate was controlled by chemisorption. The Sips model provided the best correlation of the adsorption experimental data, indicative of more than one adsorption site. The results of this study show the advantage of the Phy/B mixtures in immobilizing Eu and certain fission products by combining adsorption properties of the materials. © 2023. The Author(s).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85108836184,

title = {Seasonality of the airborne ambient soot predominant emission sources determined by raman microspectroscopy and thermo‐optical method},

author = { N. Zioła and K. Banasik and M. Jabłońska and J. Janeczek and B. Błaszczak and K. Klejnowski and B. Mathews},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85108836184&doi=10.3390%2fatmos12060768&partnerID=40&md5=1470b05b078f44fce9706addb58f83ab},

doi = {10.3390/atmos12060768},

issn = {20734433},

year  = {2021},

date = {2021-01-01},

journal = {Atmosphere},

volume = {12},

number = {6},

publisher = {MDPI AG},

abstract = {Raman microspectroscopy and thermo‐optical‐transmittance (TOT) method were used to study airborne ambient soot collected at the suburban air monitoring station in southern Poland during the residential heating (January‐February) and non‐heating (June–July) seasons of 2017. Carbonaceous material constituted on average 47.2 wt.% of PM2.5 during the heating season and 26.9 wt.% in the non‐heating season. Average concentrations of OC (37.5 ± 11.0 μg/m3) and EC (5.3 ± 1.1 μg/m3) during the heating season were significantly higher than those in the non‐heating season (OC = 2.65 ± 0.78 μg/m3; and EC = 0.39 ± 0.18 μg/m3). OC was a chief contributor to the TC mass concentration regardless of the season. All Raman parameters indicated coal combustion and bio-mass burning were the predominant sources of soot in the heating season. Diesel soot, which is structurally less ordered than soot from other sources, was dominant during the non‐heating season. The D1 and G bands area ratio (D1A/GA) was the most sensitive Raman parameter that discriminated between various soot sources, with D1A/GA > 1 for diesel soot, and less than 1 for soot from coal and wood burning. Due to high daily variability of both TOT and Raman spectroscopy data, single‐day measurements can be inconclusive regarding the soot source apportionment. Long‐time measurement campaigns are recommended. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85099802578,

title = {The impact of ambient atmospheric mineral-dust particles on the calcification of lungs},

author = { M. Jabłońska and J. Janeczek and B. Smieja-Król},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099802578&doi=10.3390%2fmin11020125&partnerID=40&md5=450e476f3b2c34c18faad8d69f4cef29},

doi = {10.3390/min11020125},

issn = {2075163X},

year  = {2021},

date = {2021-01-01},

journal = {Minerals},

volume = {11},

number = {2},

pages = {1-15},

publisher = {MDPI AG},

abstract = {For the first time, it is shown that inhaled ambient air-dust particles settled in the human lower respiratory tract induce lung calcification. Chemical and mineral compositions of pulmonary calcium precipitates in the lung right lower-lobe (RLL) tissues of 12 individuals who lived in the Upper Silesia conurbation in Poland and who had died from causes not related to a lung disorder were determined by transmission and scanning electron microscopy. Whereas calcium salts in lungs are usually reported as phosphates, calcium salts precipitated in the studied RLL tissue were almost exclusively carbonates, specifically Mg-calcite and calcite. These constituted 37% of the 1652 mineral particles examined. Mg-calcite predominated in the submicrometer size range, with a MgCO3 content up to 50 mol %. Magnesium plays a significant role in lung mineralization, a fact so far overlooked. The calcium phosphate (hydroxyapatite) content in the studied RLL tissue was negligible. The predominance of carbonates is explained by the increased CO2 fugacity in the RLL. Carbonates enveloped inhaled mineral-dust particles, including uranium-bearing oxides, quartz, aluminosilicates, and metal sulfides. Three possible pathways for the carbonates precipitation on the dust particles are postulated: (1) precipitation of amorphous calcium carbonate (ACC), followed by its transformation to calcite; (2) precipitation of Mg-ACC, followed by its transformation to Mg-calcite; (3) precipitation of Mg-free ACC, causing a localized relative enrichment in Mg ions and subsequent heterogeneous nucleation and crystal growth of Mg-calcite. The actual number of inhaled dust particles may be significantly greater than was observed because of the masking effect of the carbonate coatings. There is no simple correlation between smoking habit and lung calcification. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.},

note = {1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85082172183,

title = {The effectiveness of asbestos stabilizers during abrasion of asbestos-cement sheets},

author = { A. Obmiński and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85082172183&doi=10.1016%2fj.conbuildmat.2020.118767&partnerID=40&md5=f6c98e78d8d4328d231f75f356d36318},

doi = {10.1016/j.conbuildmat.2020.118767},

issn = {09500618},

year  = {2020},

date = {2020-01-01},

journal = {Construction and Building Materials},

volume = {249},

publisher = {Elsevier Ltd},

abstract = {The effectiveness of different organic stabilizers in stabilizing asbestos in fiber cement was evaluated using brush-abrasion tests on asbestos-cement (AC) sheets and counting the number of released respirable fibers using phase-contrast microscopy (PCM). All asbestos fibers released from the abraded sheets were identified as chrysotile. The binding effectiveness of the stabilizers varied from 35% (bitumen-based) to >90% (polyurethane resin (PUR); acrylic paint; flexible coating). Stabilizers with low binding efficiency, i.e., <80%, should not be used for coating. The 80% binding efficiency limit is suggested based on the performance of PUR stabilizer applied to the surfaces of AC sheets that were primarily in good condition. With very deteriorated surfaces, even the best performing stabilizers will not prevent fiber release on a scale comparable to that from unprotected sheets in good condition. The greatest effectiveness in binding asbestos fibers is achieved by applying stabilizers that combine a hard coating (PUR), high degree of flexibility (flexible coating) and adhesiveness (acrylic dispersion paint). A simple brush-abrasion test is recommended as an inexpensive, fast and reliable method for evaluating the performance of stabilizers. The brush-abrasion test can reveal invisible deterioration of the cement matrix weakening asbestos-fiber attachment to AC sheets. © 2020 The Author(s)},

note = {5},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85086649704,

title = {Crystal chemistry of an erythrite-köttigite solid solution (Co3–xznx) (aso4)2·8h2o},

author = { J. Ciesielczuk and M. Dulski and J. Janeczek and T. Krzykawski and J. Kusz and E. Szełęg},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85086649704&doi=10.3390%2fmin10060548&partnerID=40&md5=9390c4bc3f2543fcf7fafd4e546610fd},

doi = {10.3390/min10060548},

issn = {2075163X},

year  = {2020},

date = {2020-01-01},

journal = {Minerals},

volume = {10},

number = {6},

pages = {1-25},

publisher = {MDPI AG},

abstract = {A wide compositional range, covering about 90% of an expected erythrite-köttigite substitutional solid solution with extreme compositions of (Co2.84Mg0.14Zn0.02) (AsO4)2·8H2O and (Zn2.74Co0.27) (AsO4)2·8H2O, was revealed in a suite of samples from a polymetallic ore deposit in Miedzianka, SW Poland. Members of the solid solution series were examined by means of Electron Probe Microanalysis (EPMA), Scanning Electron Microscopy (SEM)/Energy-Dispersive Spectrometer (EDS), X-ray single-crystal and powder diffraction, and Raman spectroscopy. Metal cations were randomly distributed between two special octahedral sites in the erythrite–köttigite structure. In response to Co ↔ Zn substitutions, small but significant changes in bond distances (particularly in [AsO4] tetrahedra), rotation, and distortion of co-ordination polyhedra were observed. Two sub-series of dominant cationic substitutions (Co-Mg-Ni and Co-Fe-Zn) were noted within the arsenate series of vivianite-group minerals linked by erythrite. The paragenetic sequence erythrite → Zn-rich erythrite → Co-rich köttigite → köttigite reflects the evolution of the solution’s pH towards increased acidity and a relative increase in the concentration of Zn ions following precipitation of erythrite. © 2020 by the authors.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85092224511,

title = {Ancylite-(CE) from quartz-calcite-chlorite veins in phyllite of the opava mountains (SW Poland)},

author = { J. Janeczek and K. Szopa and M.J. Fabiańska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85092224511&doi=10.7306%2fgq.1550&partnerID=40&md5=ae73592f5c8dc1793d445466181a6157},

doi = {10.7306/gq.1550},

issn = {16417291},

year  = {2020},

date = {2020-01-01},

journal = {Geological Quarterly},

volume = {64},

number = {3},

pages = {801-806},

publisher = {Polish Geological Institute},

abstract = {Ancylite-(Ce) occurs in quartz-calcite-chlorite veins cross cutting the foliation of phyllite in the Dewon Quarry in the foot hills of the Opava Mountains of the eastern Sudetes, south-west Poland. Irregularly shaped grains of ancylite are up to 67 mm long and 22 mm wide. The compositional range of ancylite, determined by electron microprobe, is expressed by the empirical formula: (Sr0.65–0.55Ca0.19–0.14Fe0.03–0.00)∑0.87–0.69 (Ce0.58–0.50Nd0.26–0.22La0.26–0.21Pr0.06–0.05Sm0.05–0.04Gd0.07–0.03Dy0.01–0.00)S1.29–1.05(CO3)2 (OH1.07–0.99F0.22-0.0.06)∑1.29–1.05 0.95–0.93H2O. Ancylite crystallized directly from CO2-rich hydrothermal solutions as the last mineral in the veins following precipitation of calcite. The solution temperature, estimated using various chlorite geothermometres, was in the range of 260–340°C. © 2020, Polish Geological Institute. All rights reserved.},

note = {1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85074302005,

title = {Adsorption of Eu(III) onto bentonite and phyllite: A comparative study},

author = { J. Kyzioł-Komosińska and J. Janeczek and T. Krzykawski and M.J. Fabiańska and A. Matuszewska and A. Dzieniszewska and E. Teper and M. Pająk and N. Sawicka},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074302005&doi=10.1016%2fj.clay.2019.105330&partnerID=40&md5=8dbb170b69e50a5def0bb809e6ba37c9},

doi = {10.1016/j.clay.2019.105330},

issn = {01691317},

year  = {2019},

date = {2019-01-01},

journal = {Applied Clay Science},

volume = {183},

publisher = {Elsevier Ltd},

abstract = {Disposal of radioactive wastes in underground repositories necessitates knowledge on adsorption and mobility of radionuclides in host rocks (geologic barrier) and in engineered barriers, including clay barrier. The batch adsorption of Eu(III) (a homologue for trivalent radionuclides) onto phyllite compared to bentonite was studied as a function of solution pH (4.5 and 7.0), solution to clay rock ratio (10:1; 100:1; 500:1 and 1000:1), and various Eu(III) concentrations (0.01–190 mg/L; 0.658 × 10−7–1.25 × 10−3 M). The experimental data were interpreted using the isotherm models of Langmuir, Freundlich, Dubinin-Radushkevich, Tóth, and Sips. Adsorption/desorption experiments and bonding strength calculations showed that the adsorption behavior depends on the mineral composition of sorbents, solution pH, the initial concentration of Eu(III), and liquid: solution ratio (L:S). The cation exchange within the interlayer space of montmorillonite is the main adsorption mechanism in bentonite. Cation exchange on the minerals surface, chemical reactions leading to the precipitation of new phases, the electrostatic effect at a low initial concentration of Eu (III), and pH > pHPZC are adsorption mechanisms in phyllites. Solution pH has a pronounced effect on the Eu(III) adsorption onto phyllite due to surface protonation. Fe-oxides and hydroxides play a significant role in the adsorption/desorption of Eu(III) on phyllites. The best fitting was obtained for three-parameter isotherm models of Sips and Tóth. The mechanism of Eu(III) binding is complex and does not follow the ideal monolayer adsorption. While the maximum adsorption capacity of phyllite is 2.5 to 6.6 times lower than of bentonite, depending on the solution pH, it is high enough to guarantee efficacious and durable removal of actinides from the contaminated solutions, particularly at their low concentrations. Phyllites adsorption and mechanical properties make them suitable additives to bentonite in a clay barrier. © 2019 Elsevier B.V.},

note = {6},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85065084187,

title = {Identification of industrial point sources of airborne dust particles in an urban environment by a combined mineralogical and meteorological analyses: A case study from the Upper Silesian conurbation, Poland},

author = { M. Jabłońska and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85065084187&doi=10.1016%2fj.apr.2019.01.006&partnerID=40&md5=1b4e9c006179c04dbd601ee5d3a63ad7},

doi = {10.1016/j.apr.2019.01.006},

issn = {13091042},

year  = {2019},

date = {2019-01-01},

journal = {Atmospheric Pollution Research},

volume = {10},

number = {3},

pages = {980-988},

publisher = {Elsevier B.V.},

abstract = {Specific industrial point sources of PM 10 were identified by combining real-time meteorological observations and mineralogical examination (XRD; SEM-EDS; TEM-EDS) of individual particles collected during five individual week-long sampling campaigns in 2011 in the most industrialized region of Poland. Major (>20 vol%) and subordinate components of PM 10 (soot; quartz; gypsum; aluminosilicates; Fe-oxides; dolomite; and Pb-chloride) occur in different proportions season-depending and are of limited use in the identification of the emission point sources. Some minor components (particles of Cd- and Tl-bearing ZnS; and of iron and Cr-steel) related to meteorological conditions enabled identification of a large zinc refinery (35 km NW of the sampling site) and integrated iron and steelmaking plant located close to (10 km NE) the sampling site as the most probable emission point sources. Three other large steel plants located in the SW wind rose sector at a distance of 28, 75, and 80 km of the sampling site were typified as potential point sources based on submicron metal particles (Mn-alloyed steel; brass; hematite; magnetite; Fe-spinels). Combination of meteorological data and mineralogical investigation of airborne individual particles enabled distinguishing between sources of similar mineral tracers located in different sectors of wind rose and provided direct evidence for Zn and Cl speciation. © 2019 Turkish National Committee for Air Pollution Research and Control},

note = {20},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85064625238,

title = {Mineralogy and organic geochemistry of phyllite from the dewon–pokrzywna deposit, the opava mountains (SW Poland)},

author = { N. Sawicka and J. Janeczek and M.J. Fabiańska and K. Bahranowski and T. Krzykawski and A. Matuszewska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85064625238&doi=10.7306%2fgq.1439&partnerID=40&md5=444ebf986d868924057862ff85588051},

doi = {10.7306/gq.1439},

issn = {16417291},

year  = {2018},

date = {2018-01-01},

journal = {Geological Quarterly},

volume = {62},

number = {4},

pages = {817-828},

publisher = {Polish Geological Institute},

abstract = {Phyllites from the Dewon–Pokrzywna deposit in the Opava Mts., SW Poland, were investigated by XRD (Rietveld method), XRF, EPMA, SEM, and ATR-FTIR from the perspective of their potential usage as a buffer and/or backfill material in a geological repository of radioactive waste. Organic matter dispersed in the phyllite matrix was analysed by GC-MS. Fine-grained Mg-Fe-muscovite (13 to 29 wt.%), Fe-ripidolite (10 to 25 wt.%), detrital quartz (20 to 46 wt.%), and albite (7 to 28 wt.%) ± microcline, illite or illite/smectite, and kaolinite are major minerals in phyllite samples. The chlorite/muscovite ratio ranges from 0.65 to 1.1. Mg-annite inherited from the precursor rock is a minor constituent. Detrital ilmenite is a dominant accessory mineral. Ancylite-(Ce) occurs in quartz-calcite-ripidolite veins. Two types of phyllite have been distinguished based on the proportion of phyllosilicates to silt fraction: argillaceous (47 to 55 wt.% phyllosilicates) and silt-rich (28 wt.% phyllosilicates). Argillaceous phyllite shows elevated content of alumina and moderate concentration of silica. It is highly enriched in Fe compared to phyllites from other localities worldwide. The BET specific surface area of argillaceous phyllite ranges from 1.73 to 3.64 m2/g. Whole-rock chemical composition, mineral assemblages, chlorite geothermometry, and the occurrence of aliphatic hydrocarbons suggest that argillaceous phyllite originated from a pelagic pelite protolith under low-temperature (260–370°C) greenschist to subgreenschist facies conditions. Persistent biomarkers are indicative of bacterial degradation of planktonic organic matter suspended in a high water column. Enrichment in Fe-rich chlorite and Mg,Fe-muscovite, low volume of interconnected pores with dominant mesopores suggest that argillaceous phyllite from the Dewon–Pokrzywna deposit is a potential candidate for a buffer and/or backfill material. © 2018, Polish Geological Institute. All rights reserved.},

note = {3},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85040718683,

title = {Pegmatyty Norwegii - 8. Miȩdzynarodowe Sympozjum (PEG2017) na temat pegmatytów granitowych Kristiansand, Norwegia, 13-15.06.2017},

author = { J. Janeczek and E. Szełęg and K. Szopa and A. Szuszkiewicz},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85040718683&partnerID=40&md5=75bc0e4d46a334c4e232d79b86d96e65},

issn = {00332151},

year  = {2017},

date = {2017-01-01},

journal = {Przeglad Geologiczny},

volume = {65},

number = {11},

pages = {1443-1445},

publisher = {Polish Geological Institute},

abstract = {[No abstract available]},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84961859357,

title = {Mineralogy and origin of coarse-grained segregations in the pyrometallurgical Zn-Pb slags from Katowice-Wełnowiec (Poland)},

author = { R. Warchulski and A. Gawęda and J. Janeczek and M. Kądziołka-Gaweł},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961859357&doi=10.1007%2fs00710-016-0439-1&partnerID=40&md5=800a08fc08ff021df0041383b0bd385f},

doi = {10.1007/s00710-016-0439-1},

issn = {09300708},

year  = {2016},

date = {2016-01-01},

journal = {Mineralogy and Petrology},

volume = {110},

number = {5},

pages = {681-692},

publisher = {Springer-Verlag Wien},

abstract = {The unique among pyrometallurgical slags, coarse-grained (up to 2.5 cm) segregations (up to 40 cm long) rimmed by “aplitic” border zones occur within holocrystalline historical Zn-smelting slag in Katowice, S Poland. Slag surrounding the segregations consists of olivine, spinel series, melilite, clinopyroxene, leucite, nepheline and sulphides. Ca-olivines, kalsilite and mica compositionally similar to oxykinoshitalite occur in border zones in addition to olivine, spinel series and melilite. Miarolitic and massive pegmatite-like segregations are built of subhedral crystals of melilite, leucite, spinel series, clinopyroxene and hematite. Melilite, clinopyroxenes and spinels in the segregations are enriched in Zn relatively to original slag and to fine-grained border zones. The segregations originated as a result of crystallization from residual melt rich in volatiles (presumably CO2). The volatile-rich melt was separated during fractional crystallization of molten slag under the cover of the overlying hot (ca. 1250 °C) vesicular slag, preventing the escape of volatiles. That unique slag system is analogous to natural magmatic systems. © 2016, The Author(s).},

note = {10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84979556541,

title = {Chemical composition and Raman spectroscopy of cornubite and its relation to cornwallite in Miedzianka, the Sudety Mts., Poland},

author = { J. Janeczek and J. Ciesielczuk and M. Dulski and T. Krzykawski},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84979556541&doi=10.1127%2fnjma%2f2016%2f0305&partnerID=40&md5=7db6072faa3e2f05c763e21e0b40bfc3},

doi = {10.1127/njma/2016/0305},

issn = {00777757},

year  = {2016},

date = {2016-01-01},

journal = {Neues Jahrbuch fur Mineralogie, Abhandlungen},

volume = {193},

number = {3},

pages = {265-274},

publisher = {E. Schweizerbart'sche Verlagsbuchhandlung},

abstract = {Cornubite, Cu5(AsO4)2(OH)4, occurs in association with chrysocolla, cornwallite-pseudomalachite and philipsburgitekipushite series, and malachite in weathered amphibolites in dumps around a historic mining town of Miedzianka (former Kupferberg) in the Sudety Mountains, SW Poland. The averaged chemical composition of cornubite determined by EPMA is expressed by the formula: (Cu5.07Zn0.04)5.11(As0.945P0.01V0.005Si0.025O4)2(OH)4. Unit cell dimensions are: a = 6.155(1) Å},

note = {2},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84955573157,

title = {Barium concentration in cast roe deer antlers related to air pollution caused by burning of barium-enriched coals in southern Poland},

author = { M. Jabłońska and M. Kramarczyk and B. Smieja-Król and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955573157&doi=10.1007%2fs11356-016-6154-y&partnerID=40&md5=6ec0f33bf158e5c72e3962489ac491a6},

doi = {10.1007/s11356-016-6154-y},

issn = {09441344},

year  = {2016},

date = {2016-01-01},

journal = {Environmental Science and Pollution Research},

volume = {23},

number = {6},

pages = {5978-5982},

publisher = {Springer Verlag},

abstract = {Concentrations of Ba, Zn, Pb, Fe, and Mn were determined by atomic absorption spectroscopy in freshly cast antlers from male roe deer of different ages (2 to 4 years old and older than 4 years) collected in Balin near Chrzanów and in the vicinity of Żywiec, S Poland. Barium content ranged from 124 to 196 ppm (mean 165 ppm) in the Balin 12 samples and from 207 to 351 ppm (mean 287 ppm) in 3 antlers from Żywiec. The concentration of Ba was comparable to that of Zn (134–275 ppm; mean 169 ppm). Elevated concentrations of Ba in antlers most probably originated from direct uptake of airborne barite nanocrystals through the respiratory system and/or by digestion of barite-rich dust particles deposited on plants. Burning of Ba-enriched coals is regarded as the principal source of Ba in the investigated areas inhabited by roe deer. Increased concentrations of Ba in antlers from the Żywiec area compared to Balin reflect particularly high air pollution caused by coal-burning mostly for domestic purposes combined with an unfavorable topography that impedes efficient air circulation. © 2016, The Author(s).},

note = {10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84945486902,

title = {The role of authigenic sulfides in immobilization of potentially toxic metals in the Bagno Bory wetland, southern Poland},

author = { B. Smieja-Król and J. Janeczek and A. Bauerek and I.H. Thorseth},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945486902&doi=10.1007%2fs11356-015-4728-8&partnerID=40&md5=86138c9074558e3c112b95e6100a8a57},

doi = {10.1007/s11356-015-4728-8},

issn = {09441344},

year  = {2015},

date = {2015-01-01},

journal = {Environmental Science and Pollution Research},

volume = {22},

number = {20},

pages = {15495-15505},

publisher = {Springer Verlag},

abstract = {The supply of Cd, Cu, Fe, Pb, Zn, and Tl into a wetland in the industrial area of Upper Silesia, southern Poland via atmospheric precipitation and dust deposition has been counterbalanced by the biogenic metal sulfide crystallization in microsites of the thin (<30 cm) peat layer, despite the overall oxidative conditions in the wetland. Disequilibrium of the redox reactions in the peat pore water (pH 5.4–6.2) caused by sulfate-reducing microorganisms has resulted in the localized decrease in Eh and subsequent precipitation of micron- and submicron-sized framboidal pyrite, spheroidal ZnS and (Zn;Cd)S, and galena as revealed by high-resolution scanning electron microscopy (SEM)/energy dispersive spectrometer (EDS). Saturation index for each sulfide is at a maximum within the calculated Eh range of −80 and −146 mV. Lead was also immobilized in galena deposited in fungal filaments, possibly at a higher Eh. Thallium (up to 3 mg kg−1) in the peat strongly correlates with Zn, whereas Cu (up to 55 mg kg−1) co-precipitated with Pb. The metal sulfides occur within microbial exudates, which protect them from oxidation and mechanical displacement. Vertical distribution of toxic metals in the peat layer reflects differences in pollution loads from atmospheric deposition, which has been much reduced recently. © 2015, The Author(s).},

note = {19},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84901287399,

title = {Pseudomorphs of barite and biogenic ZnS after phyto-crystals of calcium oxalate (whewellite) in the peat layer of a poor fen},

author = { B. Smieja-Król and J. Janeczek and J. Wiedermann},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84901287399&doi=10.1007%2fs11356-014-2700-7&partnerID=40&md5=1d44510da777e3dbef3c5afd7e6ce891},

doi = {10.1007/s11356-014-2700-7},

issn = {09441344},

year  = {2014},

date = {2014-01-01},

journal = {Environmental Science and Pollution Research},

volume = {21},

number = {11},

pages = {7227-7233},

publisher = {Springer Verlag},

abstract = {Pseudomorphs of barite (BaSO4) and Cd-rich ZnS after whewellite (CaC2O4·H2O) occur within remnants of Scots pine bark tissues in the peat layer of a poor fen located near a zinc smelter in south Poland. A two-step formation of the pseudomorphs is postulated based on SEM observations: (1) complete dissolution of whewellite, possibly caused by oxalotrophic bacteria, and (2) subsequent bacterially induced precipitation of barite and spheroidal aggregates of ZnS together with galena (PbS) in voids left by the dissolved whewellite crystals. Local increase in pH due to microbial degradation of whewellite, elevated concentrations of Zn(II) and Ba(II) in pore water due to the decomposition of atmospheric particles of sphalerite and barite in the acidic (pH 3.5-3.8) environment, oxidation of S species during drying and rewetting of the peat layer, and subsequent partial reduction of sulfate anions by sulfur-reducing bacteria were all factors likely involved in the crystallization of ZnS and barite in the microenvironment of the post-whewellite voids. © 2014 The Author(s).},

note = {7},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84892697006,

title = {The cause and progress of the endogenous coal fire in the remediated landfill in the city of Katowice [Przebieg i przyczyny endogenicznego pozaru wȩgla kamiennego na zrekultywowanym składowisku odpadów komunalnych w Katowicach]},

author = { J. Ciesielczuk and J. Janeczek and S. Cebulak},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84892697006&partnerID=40&md5=c62f66a5636c308f77aea86668210ba4},

issn = {00332151},

year  = {2013},

date = {2013-01-01},

journal = {Przeglad Geologiczny},

volume = {61},

number = {12},

pages = {764-772},

abstract = {Slopes of the abandoned municipal waste landfill in the city of Katowice remediated in 1998 have been thermally active since 2007. The thermal activity was caused by spontaneous coal combustion within the sub-surface (0.5-1.5 m below ground level) layer of coal mine waste used for engineering the landfill. Exploitation of biogas from the landfill prior to thermal events may have enhanced exothermic oxidation of coal waste. The smoldering is the prevalent and persistent form of coal combustion in the landfill and is responsible for high emissions of CO (up to 3%), CO2 (>18%), methane and a suite of gaseous hydrocarbons. Attempts to extinguish coal fire did not prevent the advance of smoldering front at a rate of tens of metres per year.},

note = {10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84880889018,

title = {Native selenium as a byproduct of microbial oxidation of distorted pyrite crystals: The first occurrence in the Carpathians},

author = { E. Szełęg and J. Janeczek and P. Metelski},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880889018&doi=10.2478%2fgeoca-2013-0017&partnerID=40&md5=ce208fba53dbf1343f1cbd09e4d42a29},

doi = {10.2478/geoca-2013-0017},

issn = {13350552},

year  = {2013},

date = {2013-01-01},

journal = {Geologica Carpathica},

volume = {64},

number = {3},

pages = {231-236},

abstract = {Acicular crystals of native selenium up to 30 μm long occur together with barite on the surface of goethite partial pseudomorphs after millimeter-sized pseudotetragonal-prismatic pyrite crystals in calcite veins that cross-cut Senonian sandstones of the Silesian Nappe in the western Polish Outer Carpathians. Native selenium originated from selenium apparently released during bacteria-induced oxidation of pyrite at neutral or near-neutral pH conditions. Oxidizing bacteria preferentially colonized {100} faces of pyrite relative {111} faces.},

note = {4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84885054439,

title = {Indialite-rich paralava from a coalmine waste-dump, Sosnowiec, Poland},

author = { A. Gawęda and J. Janeczek and M. Kierepka and M. Kądziołko-Gaweł and T. Krzykawski},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885054439&doi=10.1127%2f0077-7757%2f2013%2f0238&partnerID=40&md5=48936a7de22d814ae483414c8de0fa40},

doi = {10.1127/0077-7757/2013/0238},

issn = {00777757},

year  = {2013},

date = {2013-01-01},

journal = {Neues Jahrbuch fur Mineralogie, Abhandlungen},

volume = {190},

number = {3},

pages = {237-251},

abstract = {High-temperature (>1000 °C) melting and pyrometamorphism of Carboniferous psammitic-pelitic rocks caused by spontaneous combustion of coal in a coal mine waste dump, Sosnowiec, Poland, produced paralava and clinker. Local differences in oxygen fugacity, melt density and viscosity led to the formation of two varieties of paralavas both with andesitic composition: reduced (dark grey) and oxidized (red). Abundant Fe-rich idiomorphic indialite (X Fe = 0.47-0.63) occurs in reduced paralava together with spinel, magnetite, hematite, rare phosphides, minor Fe-rich sapphirine and relic pyrite, monazite, xenotime, and zircon. Only few acicular crystals of indialite, skeletal spinel, and hematite occur in the oxidized paralava in addition to abundant partially resorbed quartz inherited from the sedimentary protolith. Partial melting of monazite under reducing conditions did not reset its U-Th-Pb ages despite mobilization of P and subsequent precipitation of secondary (Fe;Mn;Mg;Ca)-phosphides. Fractional crystallization combined with redox conditions was a major mechanism controlling mineral and chemical compositions of paralava. © 2013 E. Schweizerbart'sche Verlagsbuchhandlung.},

note = {2},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84861407315,

title = {Thermally induced transformation of vorlanite to "protovorlanite" : Restoration of cation ordering in self-irradiated CaUO4},

author = { E.V. Galaluskin and I.O. Galaluskina and L.S. Dubrovinsky and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84861407315&doi=10.2138%2fam.2012.4092&partnerID=40&md5=5684375567fab86cf37a5c8e3edda5e6},

doi = {10.2138/am.2012.4092},

issn = {0003004X},

year  = {2012},

date = {2012-01-01},

journal = {American Mineralogist},

volume = {97},

number = {5-6},

pages = {1002-1004},

publisher = {Walter de Gruyter GmbH},

abstract = {Vorlanite, cubic CaUO4 heated at temperatures above 750 °C, transforms irreversibly into rhombo-hedral CaUO4, proving that the latter crystallized as a precursor of vorlanite in high-temperature skarns. Vorlanite most probably originated due to pseudomorphic transformation of rhombohedral CaUO4, caused by disordering of cations and uranyl-bonds that resulted from a-decay events of uranium. The ease of the transition from rhombohedral CaUO4 to vorlanite and the fast reversal transition during heating can be explained by the similarity of both structures. Formation of vorlanite prevents CaUO4 from undergoing metamictization.},

note = {12},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-79960542165,

title = {Evaluation of the state of mineralogical sciences in Poland. Prz. Geol., 59: 469-473 [Ocena stanu nauk mineralogicznych w Polsce]},

author = { J. Janeczek and L. Marynowski},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79960542165&partnerID=40&md5=7d6eb2b993cc1503a3c7e44d264f3212},

issn = {00332151},

year  = {2011},

date = {2011-01-01},

journal = {Przeglad Geologiczny},

volume = {59},

number = {6},

pages = {469-473},

abstract = {Results of a survey conducted recently by the Mineralogical Sciences Committee of the Polish Academy of Sciences among Polish geochemists, mineralogists and penologists revealed a significant increase in a number of research articles published in ISI listed journals since the political and economic transformations in 1989 owing to the unrestricted international collaboration, better funding, unlimited access to worldwide journals and data bases and easier access to modern research equipment. Introduction of the so-called parametric evaluation of the performance of research institutions in Poland further motivates scientists to publish their papers in the most prestigious journals (category I and II on the ISI list). Relatively low impact of those articles measured by their low citation, especially by the low Hirsh index with the exception of a few authors whose papers are widely red, may have resulted from focusing on solving regional problems rather than tackling issues relevant to the whole scientific community. However, recently this trend has been reversed. The major obstacles in a more dynamic progress of Polish mineralogical sciences include limited access to modern equipment (there are only two electron microprobes in Poland available to mineralogists and none of ion microprobe) and unsatisfactory funding of research projects.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-79251561540,

title = {Vorlanite (CaU6+)O4 - A new mineral from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia},

author = { E.V. Galuskin and T.M. Armbruster and I.O. Galuskina and B. Lazic and A. Winiarski and V.M. Gazeev and P. Dzierzanowski and A.E. Zadov and N.N. Pertsev and R. Wrzalik and A.G. Gurbanov and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79251561540&doi=10.2138%2fam.2011.3610&partnerID=40&md5=cde7b101355c40a47494672affd12af8},

doi = {10.2138/am.2011.3610},

issn = {0003004X},

year  = {2011},

date = {2011-01-01},

journal = {American Mineralogist},

volume = {96},

number = {1},

pages = {188-196},

publisher = {Walter de Gruyter GmbH},

abstract = {The new mineral vorlanite, (CaU6+)O4},

note = {37},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-34249872779,

title = {Mineral composition of atmospheric dust in Biebrza National Park, Poland},

author = { A. Tondera and M. Jabłońska and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34249872779&partnerID=40&md5=89e4baa0c42e16a6478bedc5c71f7cb2},

issn = {12301485},

year  = {2007},

date = {2007-01-01},

journal = {Polish Journal of Environmental Studies},

volume = {16},

number = {3},

pages = {453-458},

abstract = {Biebrza National Park (BNP) in NE Poland is one of the least polluted regions of Europe and as such seems to be well suited for the determination of the composition of natural-background pollution of atmospheric dust. Samples of fallen dust were collected at monthly intervals between April 2003 and March 2004 in the isolated settlement of Grzedy. X-ray powder diffraction, scanning electron microscope images, and energy dispersive spectrometry revealed quartz, feldspars, micas, kaolinite, chlorite and hematite as major dust constituents. In addition, a few grains of Ni, Ni-Fe phosphide, and Fe-Ni-Cr oxides (probably of extraterrestrial origin) were observed. Anthropogenic constituents include amorphous aluminosilicates, barite, gypsum, Sn, Fe, Ti and Bi-W oxides. Quartz and feldspars constitute the majority of natural-dust pollution in BNP. Both grain size and mineral composition exhibit seasonal variations.},

note = {4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-34047170913,

title = {Single-crystal Raman investigation of vesuvianite in the OH region},

author = { E.V. Galuskin and J. Janeczek and M. Kozanecki and M. Sitarz and W. Jastrzebski and R. Wrzalik and K. Stadnicka},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34047170913&doi=10.1016%2fj.vibspec.2006.06.022&partnerID=40&md5=9d7638ac64d3966df0deb746df1e7e30},

doi = {10.1016/j.vibspec.2006.06.022},

issn = {09242031},

year  = {2007},

date = {2007-01-01},

journal = {Vibrational Spectroscopy},

volume = {44},

number = {1},

pages = {36-41},

abstract = {Vesuvianite, a ortho-diortho silicate with the simplified formula Ca19(Al; Mg; Fe; Ti; Mn; ...)13(B; Al; Fe; □)5(SiO4)10(Si2O7)4O1-2(OH; F; O; Cl)9 is a model object for IR investigations on the OH region of minerals. Vesuvianite contains two structural types of OH groups. There are four to six bands in its vibration spectra that are explained as due to different coordination effects. In this paper, the results of Raman investigations on the OH region in vesuvianite are given for the first time. Investigations on ferrous vesuvianite in rodingites from the Urals show that analogous modes are active on both FTIR and Raman spectra. Using a sample of super-clear vesuvianite with P4/n symmetry and ordered structure [a = 15.523(1) Å; c = 11.810(1) Å; P4/n; R1 = 0.0343] from Kazakhstan, it is demonstrated that the character and position of OH bands on vibration spectra are connected not only with coordination effects but also with statistically disordered proton sites and with the number and character of hydrogen bonds. The true symmetry of the vesuvianite from Kazakhstan is lower than P4/n as determined on the basis of the X-ray single-crystal diffraction data. © 2006 Elsevier B.V. All rights reserved.},

note = {9},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-13144287450,

title = {Geochemical fixation of rare earth elements into secondary minerals in sandstones beneath a natural fission reactor at Bangombé, Gabon},

author = { H. Hidaka and J. Janeczek and F.N. Skomurski and R.C. Ewing and F. Gauthier-Lafaye},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-13144287450&doi=10.1016%2fj.gca.2004.07.019&partnerID=40&md5=b2f89d9874d14e3ddfd5c2eb2cb20eda},

doi = {10.1016/j.gca.2004.07.019},

issn = {00167037},

year  = {2005},

date = {2005-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {69},

number = {3},

pages = {685-694},

abstract = {To study geochemical processes for migration and fixation of fissiogenic rare earth elements (REE) in association with uranium dissolution, in situ isotopic analyses using an ion microprobe were performed on U- and REE-bearing secondary minerals, such as coffinite, françoisite, uraniferous goethite, and uraninite found in a sandstone layer 30 to 110 cm beneath a natural fission reactor at Bangombé, Gabon. Phosphate minerals such as phosphatian coffinite and françoisite with depleted 235U (235U/238U = 0.00609 to 0.00638) contained large amount of fissiogenic light REE, while micro-sized uraninite grains in a solid bitumen aggregate have normal U isotopic values (235U/238U = 0.00725) and small amount of fissiogenic REE components. The proportions of fissiogenic and non-fissiogenic REE components in four samples from the core of BAX03 vary in depth ranging from 30 cm to 130 cm beneath the reactor, which suggests mixing between fissiogenic isotopes from the reactor and non-fissiogenic isotopes from original minerals in the sandstone. Significant chemical fractionation was observed between Ce and the other REE in the secondary minerals, which shows evidence of an oxidizing atmosphere during their formation. Pb-isotopic analyses of individual minerals do not directly provide chronological information because of the disturbance of U-Pb decay system due to recent geologic alteration. However, systematic Pb-isotopic results from all of the minerals reveal the mobilization of fissiogenic isotopes, Pb and U from the reactor in association with dolerite dyke intrusion ∼0.798 Ga ago and the formation of the secondary minerals by mixing event between 2.05 Ga-old original minerals and reactor materials due to recent alteration. Copyright © 2005 Elsevier Ltd.},

note = {20},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-3142761676,

title = {Composition and source of polycyclic aromatic compounds in deposited dust from selected sites around the Upper Silesia, Poland},

author = { L. Marynowski and M. Pięta and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-3142761676&partnerID=40&md5=862a79e424ea4d55a79edadf201e6f98},

issn = {16417291},

year  = {2004},

date = {2004-01-01},

journal = {Geological Quarterly},

volume = {48},

number = {2},

pages = {169-180},

abstract = {About 300 polycyclic aromatic compounds were identified using the GC-MS method in deposited dust collected in sites located outside the industrial belt of the Upper Silesia agglomeration. Concentrations of selected polycyclic aromatic hydrocarbons (PAH) range from 6.8 μg/g dust for anthracene to 142 μg/g dust for fluoranthene. Concentrations of highly carcinogenic PAH e.g. benzo(a)pyrene, benzofluoranthenes and benzo(a)anthracene range from 49 to 145.5 μg/g of dust. Significant concentrations (up to 35 μg/g of dust) of carcinogenic C22H14 PAHs (m/z 278) and C24H14 PAHs (m/z 302) were determined in all samples. Aromatic ketones and quinones as well as aromatic nitrogen and sulphur compounds with concentrations ranging from 2 to 45 μg/g of dust, were found in the polar NSO fraction. Molecular composition of hydrocarbons in the deposited dust is characteristic of the terrestrial organic matter, as suggested by the presence of long chain n-alkanes with odd carbon skeleton predominance, However, relatively high concentrations of steranes and distribution of homohopanes different from terrestrial organic matter suggest that part of extractable organic matter may be from diesel engine exhausts and/or paved road dust. The origin ofthe organic compounds adsorbed on the deposited dust is related to not complete coal combustion and possibly to other sources, such as automobile exhaust. The occurrence of phenyl-polyaromatic hydrocarbons and polyphenyls such as terphenyls, phenylnaphthalenes and their methyl derivatives, phenylphenanthrenes, phenylfluoranthenes and/or phenylpyrenes results from the free radical phenylation of aromatics during organic matter combustion.},

note = {33},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-2642551588,

title = {Re-examination of kochelite: A mixture of metamict fergusonite-(Y) and altered zircon},

author = { J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2642551588&doi=10.1127%2f0028-3649%2f2004%2f2004-0193&partnerID=40&md5=126bef6be001de03f69a9e18db3e2468},

doi = {10.1127/0028-3649/2004/2004-0193},

issn = {00283649},

year  = {2004},

date = {2004-01-01},

journal = {Neues Jahrbuch fur Mineralogie, Monatshefte},

number = {5},

pages = {193-207},

publisher = {E. Schweizerbart'sche Verlagsbuchhandlung},

abstract = {Kochelite, first described by WEBSKY in 1868 as a new mineral from pegmatite in the Karkonosze granite, SW Poland was considered a product or products of alteration of Zr-rich fergusonite. An investigation of a topotype sample by optical microscopy, back scattered electrons imaging and electron microprobe analysis show that the name kochelite was applied to an artificial mixture of metamict fergusonite and chemically altered partially metamict zircon. A complex pattern of chemical alteration in both fergusonite and zircon occurred due to the action of alkaline hydrothermal solution during albitization of K-feldspars. The second stage of alteration was related to the weathering of the pegmatite. © 2004 E. Schweizerbart'sche Verlagsbuchhandlung.},

note = {1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-1142293082,

title = {Hydrothermal alteration of the Strzelin granite, SW Poland},

author = { J. Ciesielczuk and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-1142293082&doi=10.1127%2f0077-7757%2f2004%2f0179-0239&partnerID=40&md5=5b3157cf3753ebfc52e95639af111c54},

doi = {10.1127/0077-7757/2004/0179-0239},

issn = {00777757},

year  = {2004},

date = {2004-01-01},

journal = {Neues Jahrbuch fur Mineralogie, Abhandlungen},

volume = {179},

number = {3},

pages = {239-264},

publisher = {E. Schweizerbart'sche Verlagsbuchhandlung},

abstract = {The Strzeline granite in SW Poland is seen in hand specimens as a fresh rock, except for bleached, approximately 5-mm-thick zones around numerous hydrothermal veins. Detailed investigations revealed, however, that at least 20 % of the whole intrusion was significantly affected by hydrothermal fluids. The degree of the alteration of the granite ranges from apparently unaltered granite to heavily altered rocks, which consist of almost no primary minerals. The mineral assemblage of hydrothermally altered granite is the same as in the hydrothermal veins and consists of hydrothermal quartz, feldspars, chlorite, titanite, muscovite, sericite, prehnite, clinozoisite, laumontite, saussurite, kaolinite and calcite. Laumontite replaced both K-feldspars and plagioclase. Mass balance calculations suggest the input of calcium and water to the highly altered granite associated with silica removal that caused decrease in rock volume. Hydrothermal mineral assemblages in the Strzelin granite formed at P-T conditions corresponding to zeolite facies and even incomplete prehnite-pumpellyite facies of low-grade metamorphism.},

note = {9},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-1542317465,

title = {Seasonal changes in the mineral compositions of tropospheric dust in the industrial region of Upper Silesia, Poland},

author = { M. Jabłońska and J. Janeczek and J.M. Rietmeijer},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-1542317465&doi=10.1180%2f0026461036760161&partnerID=40&md5=5fc2d7fb63b4b960503cf6ab58c497bb},

doi = {10.1180/0026461036760161},

issn = {0026461X},

year  = {2003},

date = {2003-01-01},

journal = {Mineralogical Magazine},

volume = {67},

number = {6},

pages = {1231-1241},

abstract = {The tropospheric dust loading in Upper Silesia (Poland) shows a steady, annually averaged supply of minerals from natural and anthropogenic sources, industrial dust emitters, domestic heating, transportation, but with superimposed seasonal changes for some dust types. Samples of airborne and deposited particles were collected at monthly intervals between 1996 and 2001 in several cities of Upper Silesia. Dust samples were examined by X-ray powder diffraction, analytical transmission electron microscopy, analytical scanning electron microscopy, and electron microprobe microanalysis. The most common dust included quartz, gypsum, coke, soot, hematite, magnetite, wüstite, bassanite, graphite and various K-, Fe- and Mg-bearing aluminosilicates, in order of decreasing abundance. Minor phases included α-iron, sulphur, sphalerite, halite, sylvite, hercynite, franklinite, baryte, dolomite, ankerite, apatite, olivine and feldspars. Quartz, and specific industrial minerals, e.g. spinels, sphalerite, olivine and iron, occurred throughout the year in almost constant abundances. The amounts of all other dust components show seasonal variations; gypsum, baryte and other sulphates are particularly abundant in winter. In general, minerals related to low-emission sources are abundant in the winter time, while both natural dusts and dust from high-emission sources are predominant during the summer. © 2003 The Mineralogical Society.},

note = {17},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0038544436,

title = {Suitability of salt-mudstones as a host rock in salt domes for radioactive-waste storage},

author = { K. Ślizowski and J. Janeczek and K. Przewłocki},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038544436&doi=10.1016%2fS0306-2619%2803%2900024-2&partnerID=40&md5=0bcf7cb9a98c9f9600f7a7baf735b487},

doi = {10.1016/S0306-2619(03)00024-2},

issn = {03062619},

year  = {2003},

date = {2003-01-01},

journal = {Applied Energy},

volume = {75},

number = {1-2},

pages = {119-128},

publisher = {Elsevier BV},

abstract = {Analysis of the rock-salt structures and of the conceptual model of SNF and radwaste repositories has shown that in the procedure of site selection, two types of host rocks namely, rock salt and salt-mudstones, should be considered. Laboratory investigations of the mineralogical, chemical, physical and geomechanical properties of salt-mudstones, from the point-of-view of their suitabilities for containing radwaste deposition, are described. The results obtained were compared with the results for rock salt. © 2003 Elsevier Science Ltd. All rights reserved.},

note = {9},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0036264448,

title = {Activation energy of annealed metamict gadolinite from 57Fe Mössbauer spectroscopy},

author = { D. Malczewski and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036264448&doi=10.1007%2fs00269-001-0221-7&partnerID=40&md5=eab19e81470c581af320c5f89de08524},

doi = {10.1007/s00269-001-0221-7},

issn = {03421791},

year  = {2002},

date = {2002-01-01},

journal = {Physics and Chemistry of Minerals},

volume = {29},

number = {3},

pages = {226-232},

abstract = {Gadolinite, REE2FeBe2Si2O 0, is commonly metamict. 57Fe Mössbauer annealing studies of fully metamict gadolinite from Ytterby, Sweden, have been completed in argon atmosphere from 873 to 1473 K. This technique has rarely been employed in studies of metamict minerals. Changes in the experimental parameters of Mössbauer spectra are sensitive indicators of the thermal recrystallization process of metamict gadolinite and revealed two stages of the structural recovery: a major stage from 873 to 1073 K and a slower recovery stage from 1133 to 1473 K. These observations are confirmed by X-ray powder diffraction. In relation to the first stage, the exponential behaviour of the changes in the Mössbauer parameters can be used for deriving the activation energy Ea of the recrystallization process. The calculated value Ea = 1.97 eV in argon atmosphere explains the common occurrence of gadolinite in the fully or partially metamict state. Results of Mössbauer spectroscopy suggest that the recrystallization of metamict gadolinite is a displacive transition that involves rotation and translation of S O4 and BeO4 to their normal positions associated with removal of OH groups from the structure.},

note = {11},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0035730753,

title = {The origin of colour of chrysoprase from Szklary (Poland) and Sarykul Boldy (Kazakhstan)},

author = { M. Sachanbiński and J. Janeczek and A. Platonov and F.J.M. Rietmeijer},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035730753&doi=10.1127%2f007777502753418584&partnerID=40&md5=a474077c90bdff875c7cca1cc350763b},

doi = {10.1127/007777502753418584},

issn = {00777757},

year  = {2001},

date = {2001-01-01},

journal = {Neues Jahrbuch fur Mineralogie, Abhandlungen},

volume = {177},

number = {1},

pages = {61-76},

abstract = {Samples of chrysoprase from the chrysoprase "type" locality in Szklary, Poland and from Sarykul Boldy in Kazakhstan were investigated by analytical transmission electron microscopy, optical spectroscopy and infrared spectroscopy in order to determine the origin of its unique green colour. The allochromatic "apple-green" colour of chrysoprase results from nanometer-size inclusions of aggregates of Ni-bearing phyllosilicates and protophyllosilicates, mainly Ni-kerolite and minor pimelite, that occur predominantly draped on silica (sub-) grains. There is no evidence for bunsenite in the chrysoprases. The occurrence of mineral inclusions containing Fe3+ ions modify the chrysoprase green colour by adding yellowish hue. The bluish hues result from the λ-dependent light scattering on microdefects in the chalcedony matrix, e.g. silica globules, nano-and micrometer mineral inclusions and gas-liquid inclusions.},

note = {18},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0034936224,

title = {Fine-grained barite in coal fly ash from the Upper Silesian Industrial Region},

author = { M. Jabłońska and F.J.M. Rietmeijer and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034936224&doi=10.1007%2fs002540100302&partnerID=40&md5=39bc66f2b31ab188fd69dcd12e1901ef},

doi = {10.1007/s002540100302},

issn = {09430105},

year  = {2001},

date = {2001-01-01},

journal = {Environmental Geology},

volume = {40},

number = {8},

pages = {941-948},

abstract = {Barite nanocrystals are common and abundant in the troposphere over the Upper Silesian Industrial Region, Poland. The presence of barite nanocrystals is the result of burning Ba-enriched coals (up to 4,260 ppm Ba). ATEM, ASEM and EPMA analyses provided evidence of inefficient coal burning for domestic purposes at temperatures of 800-900 °C as the cause of emissions of barite, which survived unmelted. Much higher temperatures of coal burning for industrial purposes resulted in thermal decomposition of barite into BaO, which could react with airborne sulfuric acid to produce nanometre-sized secondary barite. Formation of both the secondary barite and gypsum in the troposphere contributes to the lowering of acidity of rain over Upper Silesia. Barite nanocrystals are often embedded in sheets of hydrocarbon materials with sizes in the range of respirable aerosols; therefore, they may enter the human respiratory system.},

note = {30},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0034515683,

title = {Crandallites and coffinite: retardation of nuclear reaction products at the bangombé natural fission reactor},

author = { K.A. Jensen and J. Janeczek and R.C. Ewing and P. Stille and F. Gauthier-Lafaye and S. Salah},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034515683&partnerID=40&md5=004c52a1d370c76af7bc3dd36ea956c6},

issn = {02729172},

year  = {2000},

date = {2000-01-01},

journal = {Materials Research Society Symposium - Proceedings},

volume = {608},

pages = {525-532},

abstract = {Various REE-Sr-(Pb)-crandallites, uraninite, and coffinite in the near-field of the 2 Ga old supergene-altered Bangombé U-deposit and its natural fission reactor (RZB) have been examined. The crandallite minerals may have formed during syncriticality host-rock alteration, continous alteration of phosphates, episodic Pb-loss and/or supergene weathering. Coffinitization with P2O5 and SO4-substitution has occurred immediately below RZB and resulted in extensive loss of U (≤ 46%) and enrichment of Ce (≤ 190%) and Nd (≤ 780%). Additional loss of U during coffinitization also may have occurred due to dissolution. Current alteration under oxidizing conditions has resulted in partial dissolution of uraninite and coffinite and the formation of uranyl phases. Despite supergene alteration, the hydrogeochemistry (3.09 ppt U [235U/238U = 0.7012 to 0.7019%], 4.96 ppt Ce, and 1.92 ppt Nd) suggests a remarkable retardation of lanthanides and depleted uranium by REE-Sr-(Pb)-crandallites, uraninite, coffinite, and uranyl phases at RZB. © 2000 Materials Research Society.},

note = {10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-33750568668,

title = {Mineralogy and geochemistry of natural fission reactors in Gabon},

author = { J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33750568668&partnerID=40&md5=77dc45a440a314cdeaa76c44ae07701c},

issn = {15296466},

year  = {1999},

date = {1999-01-01},

journal = {Reviews in Mineralogy and Geochemistry},

volume = {38},

pages = {320-392},

abstract = {[No abstract available]},

note = {39},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0030780152,

title = {Mineral chemistry and oxygen isotopic analyses of uraninite, pitchblende and uranium alteration minerals from the Cigar Lake deposit, Saskatchewan, Canada},

author = { M. Fayek and J. Janeczek and R.C. Ewing},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030780152&doi=10.1016%2fS0883-2927%2897%2900032-2&partnerID=40&md5=cac36d54181d00b5416052f84bc17209},

doi = {10.1016/S0883-2927(97)00032-2},

issn = {08832927},

year  = {1997},

date = {1997-01-01},

journal = {Applied Geochemistry},

volume = {12},

number = {5},

pages = {549-565},

abstract = {The Cigar Lake unconformity-type U deposit is one of the largest and highest grade U deposits in the Proterozoic Athabasca Basin, northern Saskatchewan, Canada. Cigar Lake has recently been the focus of an international, 3-a, collaborative program in which this U deposit was studied as a natural analogue for a spent nuclear fuel repository. The deposit is located near the eastern margin of the Athabasca Basin, 430 m below the surface, at the intersection between Hudsonian-age faults and the unconformity between Athabasca group sandstones and Aphebian metasediments. Three stages of U mineralization have been identified based on cross-cutting relationships and textures observed in thin section and back-scattered electron (BSE) images, O isotope data and chemical compositions. All stages of U mineralization have been variably altered to Ca-rich, U-hydrate minerals or uranyl oxide hydrate minerals and coffinite. U-Pb chemical ages of the 3 stages of U mineralization from Cigar Lake coincide with the 3 major fluid events that precipitated clay and silicate minerals at 1500 Ma 950 Ma and 300 Ma, throughout the entire Athabasca Basin. Stage 1 and 2 uraninite and pitchblende have the lowest δ18O values that range from - 30.1‰ to - 15.2‰; whereas, stage 3 uraninite has δ18O values ranging from - 10.0‰ to - 3.4‰. Uranyl oxide hydrate minerals have δ18O values that range from -11.3‰ to -8.2‰; whereas, uranyl minerals have much higher δ18O values. Based on U-Pb chemical ages, δ18O values, and petrographic relationships of U alteration minerals associated with primary U mineralization, the Cigar Lake U ore is similar to U ore from other unconformity-type U deposits in the Athabasca Basin. Therefore, the Cigar Lake ore deposit, although surrounded by clay and sandstone barriers, has been effected by the same fluid events that have altered other unconformity-type U deposits in the Athabasca Basin. The 3 stages of ore formation and associated alteration minerals permit the detailed study of fluids responsible for U deposition and alteration. This information provides the necessary context for the evaluation of the Cigar Lake deposit as a 'natural analogue' for the disposal of spent nuclear fuel in underground vaults in rocks of the Canadian Shield.},

note = {77},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0030616186,

title = {An analytical electron microscope study of airborne industrial particles in Sosnowiec, Poland},

author = { F.J.M. Rietmeijer and J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030616186&doi=10.1016%2fS1352-2310%2896%2900357-3&partnerID=40&md5=77f51fb53a19fb636ac29bac309d01f9},

doi = {10.1016/S1352-2310(96)00357-3},

issn = {13522310},

year  = {1997},

date = {1997-01-01},

journal = {Atmospheric Environment},

volume = {31},

number = {13},

pages = {1941-1951},

abstract = {The types and the relative amounts of airborne particles in the city of Sosnowiec (Poland) during 21-22 June, 1994 were identified by analytical electron microscope analyses. They are mostly aspherical angular Al-bearing silica particles (0.1-5.15 μm) and clusters thereof. Carbonaceous particles form sheets of soluble volatile-rich materials (0.3-33.9 μm) and rare soot. Numerous nanometer-sized Al-bearing silica grains and salt minerals are associated with the larger particles. They resulted from inefficient combustion of low-grade coals by the local industries whereby the silica particles are coal impurities that survived combustion. The total particle emission was constant during a 24 h period but silica shards dominated the nighttime emission while carbonaceous particles abounded during the daytime. This study showed that tropospheric particles in regions dominated by inefficient coal combustion are fundamentally different from typical coal fly ash spheres.},

note = {22},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0030369977,

title = {Nb-, Ta- and Sn-rich titanite and its alteration in pegmatites from Żólkiewka, Poland},

author = { J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030369977&partnerID=40&md5=da4bb10cec9614863bb4450c3af4178f},

issn = {00283649},

year  = {1996},

date = {1996-01-01},

journal = {Neues Jahrbuch fur Mineralogie, Monatshefte},

number = {10},

pages = {459-469},

abstract = {Titanite enriched in Nb (x̄ = 5.84 wt % Nb2O5), Ta (x̄ = 2.88 wt % Ta2O5), Sn (x̄ = 2.81 wt % SnO2), and also in Al (x̄ = 2.69 wt % Al2O3) and Fe (x̄ = 1.96 wt % FeO) has been found in a miarolitic pegmatite near Strzegom in SW Poland in association with microcline, albite, Fe-chlorite, fluorite, pyrite and stilbite. Between 25% to 35% of the Ti was substituted by other cations in this titanite. The principal substitution mechanisms include: Al3+ + (Nb,Ta)5+ = 2Ti4+; Al3+ + (F,OH)- = Ti4+ + O2-; and Sn4+ = Ti4+. Based on stoichiometric considerations, Fe in titanite is, at least in part, divalent. The titanite was partially altered due to leaching of Nb, Sn, Fe and Ta by low-temperature hydrothermal solutions. As the result of the preferential leaching of Nb over Ta, the Nb/Ta ratio changed from 3.42 in primary titanite to 0.46 in the altered parts.},

note = {10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0030565726,

title = {Uraninite and UO2 in spent nuclear fuel: A comparison},

author = { J. Janeczek and R.C. Ewing and V.M. Oversby and L.O. Werme},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030565726&doi=10.1016%2fS0022-3115%2896%2900345-5&partnerID=40&md5=cc7684b21ce748ff1c2dc87e7dc0c26b},

doi = {10.1016/S0022-3115(96)00345-5},

issn = {00223115},

year  = {1996},

date = {1996-01-01},

journal = {Journal of Nuclear Materials},

volume = {238},

number = {1},

pages = {121-130},

abstract = {Similarities and differences between uraninite and uranium dioxide in spent nuclear fuel are discussed in detail. Uraninite and its morphological variety, pitchblende, display structural and chemical properties and features that can be considered analogous to UO2 in spent nuclear fuel, despite the different thermal histories and irradiation conditions. The similarities include topologically identical structures, high resistance to radiation damage, solid solutions with ThO2, CaO, and RE2O3, similar behavior during oxidation, and presence of fission products in uraninite from natural fission reactors in Gabon. The behavior of fission product residues during alteration of uraninite to coffinite in natural fission reactors may aid in estimation of the long-term behavior of fission products from spent fuels under repository disposal conditions.},

note = {81},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0030437229,

title = {Florencite-(La) with fissiogenic REEs from a natural fission reactor at Bangombe, Gabon},

author = { J. Janeczek and R.C. Ewing},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030437229&doi=10.2138%2fam-1996-9-1024&partnerID=40&md5=761b61f0e2464f1a8f0ea300358353fe},

doi = {10.2138/am-1996-9-1024},

issn = {0003004X},

year  = {1996},

date = {1996-01-01},

journal = {American Mineralogist},

volume = {81},

number = {9-10},

pages = {1263-1269},

publisher = {Mineralogical Society of America},

abstract = {Florencite-(La) (La/Ce = 1.09) with fissiogenic REEs and florencite-(Ce) (La/Ce = 0.62) have been identified in illite From the clay mantle surrounding a natural, 2 Ga fission reactor at Bangombé and in sandstone beneath the reactor zone, respectively. Florencite-(Ce) is apparently unrelated to nuclear processes and occurs with monazite-(Ce), apatite, TiO2 (probably anatase), zircon, and illite. Grains of florencite-(Ce) contain inclusions of thorite, chalopyrite, and galena. Florencite-(La) was found S cm from the "core" of the reactor and contains inclusions of galena and U-Ti-bearing phases. Secondary uraninite and coffinite have precipitated on some of the florencite grains. The chemical composition of florencite-(La) as determined by electron microprobe analysts is (La0.38Ce0.35Nd0.06Sm0.01-Ca 0.03Sr0.17)(Al2.98Fe0.02 +)(PO4)[PO3.80(OH)0.20](OH) 6. Secondary ion mass spectrometry revealed that between 27 and 30% of Nd and 67 and 71% of Sm in florencite-(La) is fissiogenic. The presence of fissiogenic REEs in "florencite" from the reactor zone in Bangombé and their preferential concentration in florencite relative to the bulk sample of clay demonstrate that aluminous phosphates may have played a more significant role in the fixation of fissiogenic REEs released from uraninite after the sustained fission reactions than sorption onto clays.},

note = {33},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0001565133,

title = {Phosphatian coffinite with rare earth elements and Ce-rich françoisite-(Nd) from sandstone beneath a natural fission reactor at Bangombé, Gabon},

author = { J. Janeczek and R.C. Ewing},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001565133&doi=10.1180%2fminmag.1996.060.401.14&partnerID=40&md5=6a98fa8cdcd4266e45fdbb3166416882},

doi = {10.1180/minmag.1996.060.401.14},

issn = {0026461X},

year  = {1996},

date = {1996-01-01},

journal = {Mineralogical Magazine},

volume = {60},

number = {4},

pages = {665-669},

publisher = {Mineralogical Society},

abstract = {[No abstract available]},

note = {44},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0000885212,

title = {Clays at the Natural Nuclear Reactor at Bangombé, Gabon: Migration of Actinides},

author = { P.O. Eberly and R.C. Ewing and J. Janeczek and A. Furlano},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000885212&doi=10.1524%2fract.1996.74.special-issue.271&partnerID=40&md5=a2d3dc9457eeecad92a53d94946824b2},

doi = {10.1524/ract.1996.74.special-issue.271},

issn = {00338230},

year  = {1996},

date = {1996-01-01},

journal = {Radiochimica Acta},

volume = {74},

pages = {271-275},

publisher = {R. Oldenbourg Verlag GmbH},

abstract = {Clay minerals were examined from the natural nuclear reactor at Bangombé. The clay mineralogy of the reactor facies is: illite, kaolinite and minor chlorite (FB formation); illite with chlorite and kaolinite in hydrothermal veins (argile de pile); illite and chlorite (reactor core); and i) chlorite and kaolinite ± illite ± smectite or ii) illite in the underlying FA formation. Illite crystallinity values are in general highest in rocks that experienced the highest temperatures during reactor operation. Chlorite chemistry varies with respect to position around the reactor: both di-tri and trioctahedral chlorites are present in hydrothermal veins within the argile de pile, dioctahedral chlorites are present in the FA formation within cm of the reactor core, trioctahedral chlorites are present within a meter of the reactor. Chemical data for the argile de pile and the FB formation suggest that formation of the former unit occurred as a result of thermal metamorphism of the FB pelites. as opposed to large-scale dissolution of the sandstones of the FA formation. Autoradiography is used to study the sorptive characteristics of the clays for actinides. The results show that actinide sorption varies in the order: chlorite > illite ≅ kaolinite.},

note = {18},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0028794394,

title = {Mechanisms of lead release from uraninite in the natural fission reactors in Gabon},

author = { J. Janeczek and R.C. Ewing},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0028794394&doi=10.1016%2f0016-7037%2895%2900117-4&partnerID=40&md5=9eed11720fb48e4bc066c4e56a4ff030},

doi = {10.1016/0016-7037(95)00117-4},

issn = {00167037},

year  = {1995},

date = {1995-01-01},

journal = {Geochimica et Cosmochimica Acta},

volume = {59},

number = {10},

pages = {1917-1931},

abstract = {Twenty-four samples of uranium ore from the natural fission reactors in Gabon were studied by detailed electron microprobe analysis and backscattered electron imaging in order to determine the behavior of radiogenic Pb and fissiongenic nuclides. Lead content in uraninite varies from 19 wt% PbO in relicts of pristine uraninite, which were found only in reactor zone 10, to less than 5 wt% in altered uraninites. Different mechanisms of Pb loss from uraninite prevailed in different reactor zones and included leaching, grain boundary diffusion, exsolution via continuous precipitation, and volume diffusion. As a result of these processes, Pb content in uraninites from all the reactor zones, except for reactor zone 10, are similar and vary around a mean value of 5.2 wt% PbO. All of these processes were thermally activated and episodic. The predominance of any single mechanism in a particular reactor zone was controlled by the accessibility of solutions to the uranium ore. The thermal event which caused Pb mobilization in the deposits resulted from regional igneous activity in the Franceville Basin more than 1100 Ma after the reactors sustained spontaneous fission reactions. Reducing conditions prevented the long distance migration of Pb, as well as of fissiongenic Mo and Ru. © 1995.},

note = {81},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0028562264,

title = {The effect of aluminous titanite on the biotite-chlorite and amphibole-chlorite reactions},

author = { J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0028562264&doi=10.1127%2fejm%2f6%2f5%2f0623&partnerID=40&md5=0fc8108e4ea80f88542f5b8e77fe64a0},

doi = {10.1127/ejm/6/5/0623},

issn = {09351221},

year  = {1994},

date = {1994-01-01},

journal = {European Journal of Mineralogy},

volume = {6},

number = {5},

pages = {623-625},

abstract = {The effect of Al-rich titanite (XAl = 0.27 - 0.31) on formulation of mass transfer during biotite-chlorite and amphibole (pargasite)-chlorite reactions has been evaluated. The amount of Al-titanite in the chloritization reaction cannot be derived from the number of Ti atoms in 1 mole of biotite (TiBi) or amphibole (TiAmph) but is equal TiBi(Amph)/TiTit, where TiTit = 1 - AlTit and TiBi and TiAmph are atoms of Ti and Al per formula unit of titanite. The assumption of ideal titanite stoichiometry can lead to incorrect estimates of the amount of both titanite and chlorite produced. -Author},

note = {10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0027884610,

title = {Oxidation of uraninite: Does tetragonal U3O7 occur in nature?},

author = { J. Janeczek and R.C. Ewing and L.E. Thomas},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027884610&doi=10.1016%2f0022-3115%2893%2990260-6&partnerID=40&md5=f397fb3ceb06069d0e1e1c2097dd643e},

doi = {10.1016/0022-3115(93)90260-6},

issn = {00223115},

year  = {1993},

date = {1993-01-01},

journal = {Journal of Nuclear Materials},

volume = {207},

number = {C},

pages = {177-191},

abstract = {Samples of uraninite and pitchblende annealed at 1200°C in H2, and untreated pitchblende were sequentially oxidized in air at 180-190°C, 230°C, and 300°C. Uraninite and untreated pitchblende oxidized to the U4O9-type oxide, and their X-ray symmetry remained isometric up to 300°C. Reduced pitchblende after oxidation to UO2 + x and U4O9-type oxides transformed into α-U3O8 at 300°C. Two major mechanisms control uraninite and untreated pitchblende stability during oxidation: (1) Th and/or REE maintain charge balance and block oxygen interstitials near impurity cations; (2) the uraninite structure saturates with respect to excess oxygen and radiation-induced oxygen interstitials. Untreated pitchblende during oxidation behaved similarly to irradiated UO2 in spent nuclear fuel; whereas, reduced pitchblende resembled nonirradiated UO2. An analysis of the data in the literature, as well as our own efforts to identify U3O7 in samples from Cigar Lake, Canada, failed to provide conclusive evidence of the natural occurrence of tetragonal α-U3O7. Most probably, reported occurrences of U3O7 are mixtures of isometric uraninites of slightly different compositions. © 1993.},

note = {23},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0027488176,

title = {Annealing of radiation damage in allanite and gadolinite},

author = { J. Janeczek and R.K. Eby},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027488176&doi=10.1007%2fBF00202971&partnerID=40&md5=a1ddf4c53520ac8349dd98a79d474c6a},

doi = {10.1007/BF00202971},

issn = {03421791},

year  = {1993},

date = {1993-01-01},

journal = {Physics and Chemistry of Minerals},

volume = {19},

number = {6},

pages = {343-356},

publisher = {Springer-Verlag},

abstract = {Samples of allanite and gadolinite with a range of alpha-recoil damage 0.1 to 3.0 dpa, were annealed in Ar and analysed by X-ray powder diffraction (XRD), high resolution transmission electron microscopy (HRTEM), infrared (IR) and differential thermal analysis (DTA). Samples that were fully metamict, and also amorphous regions of partially metamict samples, annealed according to the Ostwald step rule. After annealing, X-ray crystalline material still showed significantly damaged regions under transmission electron microscopy (TEM). Hydrothermal annealing of fully metamict gadolinite at 710° C and PH2O=2.3 kbar resulted in direct recrystallization. Direct recrystallization, by heterogeneous nucleation, occurred also in samples with significant amount of relict crystalline material. Of two exotherms observed on DTA curves for fully metamict gadolinite only one, at 840° C, resulted from recrystallization. The second exotherm at 895° C was related to the transformation of a transitional, high-temperature γ-phase into gadolinite. The activation energy of recrystallization of partially metamict gadolinite is 0.58 eV. The same annealing path for fully metamict gadolinite and for the amorphous component of partially metamict allanite is consistent with the model of an aperiodic random network structure of metamict minerals. © 1993 Springer-Verlag.},

note = {48},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0027109317,

title = {Dissolution and alteration of uraninite under reducing conditions},

author = { J. Janeczek and R.C. Ewing},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027109317&doi=10.1016%2f0022-3115%2892%2990084-X&partnerID=40&md5=adef2df7cfdf1844f7c8598d3a642a80},

doi = {10.1016/0022-3115(92)90084-X},

issn = {00223115},

year  = {1992},

date = {1992-01-01},

journal = {Journal of Nuclear Materials},

volume = {190},

number = {C},

pages = {157-173},

abstract = {The behavior of uraninite under hydrothermal, reducing conditions is discussed on the basis of data in the literature and the authors' investigation of samples from two natural analogue sites: Oklo, Gabon and Cigar Lake, Canada. Uraninite under reducing conditions, in the presence of saline hydrothermal solutions may be altered through dissolution, preferential loss of lead and/or Y + HREE, and coffinitization. Textural features indicative of dissolution of uraninite include embayed grain boundaries, corroded relicts of uraninite embedded in a clay matrix, and replacement of uraninite by clays and sulfides. The alteration textures and phase chemistries at Oklo and Cigar Lake are remarkably similar. Dissolution of uraninite at Cigar Lake and Oklo was associated with the precipitation of illite and was probably caused by saline, moderately acidic solutions at approximately 200°C. Increased oxygen fugacity may have occurred locally due to release of excess oxygen from uraninite during dissolution or by α-radiolysis of the solution. The formation of Pb-rich (up to 18 wt% Pb, uraninite-I) and Pb-depleted (approximately 7-8 wt% Pb, uraninite-II) uraninites at both Oklo and Cigar Lake resulted from the loss of Pb due to predominantly episodic volume diffusion related to regional geologic events. Lead loss was not associated with U mobilization. In addition to uraninite dissolution, coffinitization resulted in U, Pb, and REE release. © 1992.},

note = {112},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0027109291,

title = {Structural formula of uraninite},

author = { J. Janeczek and R.C. Ewing},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027109291&doi=10.1016%2f0022-3115%2892%2990082-V&partnerID=40&md5=b309dd3b00756b0fc0c74996032771d2},

doi = {10.1016/0022-3115(92)90082-V},

issn = {00223115},

year  = {1992},

date = {1992-01-01},

journal = {Journal of Nuclear Materials},

volume = {190},

number = {C},

pages = {128-132},

abstract = {A revised structural formula for uraninite, nominally UO2, is presented: (U1-x-y-z4+Ux6+ REEy3+Mz2+)O2+x-(0.5y)-z, which emphasizes the role of cationic substitutions. This formula clarifies the relationship between structural properties (e.g., unit cell parameters), oxidation state (U6+/U4+ ratio), and phase transformations with increasing concentrations of excess oxygen. The formula demonstrates that the amount of excess oxygen required to compensate for increased positive charge due to U6+ is less than suggested by the amount of U6+ alone. This may increase the stability field of uraninite under oxidizing conditions relative to synthetic UO2+x. © 1992.},

note = {131},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0026472058,

title = {Babingtonite, Y-Al-rich titanite, and zoned epidote from the Strzegom pegmatites, Poland},

author = { J. Janeczek and M. Sachanbiński},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0026472058&doi=10.1127%2fejm%2f4%2f2%2f0307&partnerID=40&md5=10dfe1bb945f1c3358c1539bd5b5122d},

doi = {10.1127/ejm/4/2/0307},

issn = {09351221},

year  = {1992},

date = {1992-01-01},

journal = {European Journal of Mineralogy},

volume = {4},

number = {2},

pages = {307-319},

abstract = {Babingtonite, a new mineral to Poland, occurs in miarolitic pegmatites of the Strzegom-Sobotka granitic massif together with microcline-perthite, epidote, titanite, bavenite, stilbite, and calcite. Babingtonite, Ca3.96(Fe3+1.76Fe2+1.41Mg0.42Mn0.32Al0.04) [Si10.09O29], shows patchy zoning of Mg and Mn substituting for Fe2+. Unit-cell parameters are a 7.470(4) Å, b 12.493(6) Å, c 6.692(3) Å, α 85.73(5)°, β 93.66(5)°, γ 112.33(4)°. D=3.35 g cm-3. Zoned titanite associated with babingtonite is enriched in both Y and Al. The core of the crystal has Y2O36.02, REE 0.88, Al2O3 5.42 wt% and rims have Y2O3 3.63, 2.34, REE 0.48, 0.40, Al2O3 4.77, 4.57 wt%. Y+REE substitute for Ca and (Al+Fe3+) for Ti in the titanite structure. The zoning pattern of epidote crystals consists of a core surrounded by oscillatory- and sector-zoned rim overgrown by patchy zoned later generation epidote. Some zones are extremely Fe-rich (Ps 50.5). Babingtonite crystallized from locally Al-depleted hydrothermal solution at high H2O activity and oxygen fugacity close to HMM buffer. -Authors},

note = {6},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0026253848,

title = {X-ray powder diffraction study of annealed uraninite},

author = { J. Janeczek and R.C. Ewing},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0026253848&doi=10.1016%2f0022-3115%2891%2990366-F&partnerID=40&md5=62eff2de7f6ea98806350e53d9d47b60},

doi = {10.1016/0022-3115(91)90366-F},

issn = {00223115},

year  = {1991},

date = {1991-01-01},

journal = {Journal of Nuclear Materials},

volume = {185},

number = {1},

pages = {66-77},

abstract = {Natural UO2+x (uraninite) samples were annealed in a reducing atmosphere up to 1200°C. The initial unit cell parameters of 0.5385, 0.5439 and 0.5458 nm increased after annealing to 0.5469, 0.5447 and 0.5462 nm, respectively. In one sample the unit cell parameter decreased from 0.5463 nm to 0.5456 nm. Migration of point defects in the oxygen sub-lattice occurs at 300°C. In the interval of 500 to 700°C, uranium vacancies migrate and cluster. The formation of uranium vacancies is enhanced by the presence of radiogenic Pb. Above 750°C, the unit cell parameter increases as a result of reduction U6+ to U4+. Uraninite incongruently decomposes at 1100°C. Density increased after annealing except for one sample in which a large number of bubbles (1-2 μm in size) formed. The complex annealing behavior of uraninite is due to the presence of impurities (Pb, Ca, Th, Zr, REE), mixed oxidation states of uranium, and α-decay event radiation damage. © 1991.},

note = {36},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0001166148,

title = {In situ TEM study of ion-beam-induced amorphization of complex silicate structures},

author = { L.M. Wang and R.K. Eby and J. Janeczek and R.C. Ewing},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001166148&doi=10.1016%2f0168-583X%2891%2995245-9&partnerID=40&md5=675a1045006613abfc55d3a67e4cace4},

doi = {10.1016/0168-583X(91)95245-9},

issn = {0168583X},

year  = {1991},

date = {1991-01-01},

journal = {Nuclear Inst. and Methods in Physics Research, B},

volume = {59-60},

number = {PART 1},

pages = {395-400},

abstract = {The in situ transmission electron microscopy (TEM) with ion-irradiation technique has been used for the first time to study the radiation-induced amorphization (metamictization) process of naturally occurring silicates: neptunite [Na2KLi(Fe,Mn)2Ti2(SiO3)8], titanite (CaTiSiO5), gadolinite (REE2FeBe2Si2O10), zircon (ZrSiO4) and olivine [(Mg,Fe)2SiO4]. These phases were irradi 1.5 MeV Kr+ ions in the Argonne HVEM-Tandem facility at room temperature with the electron diffraction pattern monitored in situ. The critical doses required for amorphization of the electron transparent thickness of neptunite, titanite, gadolinite, zircon and olivine have been determined to be 1.7, 2.0, 2.3, 4.8 and 6.0 × 1014 ions/cm2, respectively. The results show a correlation between amorphization dose and the chemical and structural complexity of these five phases. The most complex structure (e.g. neptunite) becomes amorphous at the lowest critical dose. The critical amorphization dose also increases with the increasing melting temperature of the minerals. © 1991.},

note = {43},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0022488286,

title = {Chemistry, optics, and crystal growth of milarite from Strzegom, Poland.},

author = { J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0022488286&doi=10.1180%2fminmag.1986.050.356.10&partnerID=40&md5=6f4948bbb7fc16f1657867f7057d08d7},

doi = {10.1180/minmag.1986.050.356.10},

issn = {0026461X},

year  = {1986},

date = {1986-01-01},

journal = {Mineralogical Magazine},

volume = {50},

number = {2},

pages = {271-277},

abstract = {Hexagonal, pale green, transparent crystals of milarite = or <4 mm in length were found in a cavity in a pegmatitic segregation (with albite, stilpnomelane and chabazite) in a granite. They have epsilon 1.534, omega 1.535; D 2.55 g/cm3; a 10.418, c 13.817 A. Anomalous biaxial sectors and birefringent optical patterns are visible in basal sections; 2V varies from 34o in the (0001) sector to 64o in the (1011) sector. Microprobe analyses reveal a uniform distribution of K2O, whereas CaO and Al2O3 are higher in prismatic and pyramidal sectors than in the basal sector; Al2O3 decreases in the outer zone due to Be-Al substitution. The average anhydrous formula is:(K0.98Na0.01)Ca1.93Mn0.02(Be2.16Al0.93)(Si12O30) but IR data indicate the presence of H2O molecules. Rhythmic fluctuations in the growth rate may have resulted in internal strain, inducing the anomalous optics.-R.A.H.},

note = {6},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0022192967,

title = {Polish with English summary [(Typomorphic minerals of pegmatites from the Strzegom-Sobotka granitic massif.)]},

author = { J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0022192967&partnerID=40&md5=182ac6f6a98352284267bf14a9488c73},

issn = {0072100X},

year  = {1985},

date = {1985-01-01},

journal = {Geologia Sudetica},

volume = {20},

number = {2},

pages = {1-82},

abstract = {The mineralogy and paragenetic relationships of the Strzegom pegmatites are described. The hydrothermal minerals occur mainly in miarolitic cavities from the western part of the massif, whereas the eastern part has a lack of such drusy cavities but beryl- and garnet-bearing pegmatite veins are predominant in the area. XRD, DTA and TG data are presented for cryptomelane, calcite, alkali feldspars, stilbite, chabazite, laumontite, heulandite, scolecite, muscovite, zinnwaldite, chlorite, nontronite, beryl, epidote, garnet, prehnite, schorl, axinite and hornblende, with partial chemical analyses for cryptomelane, muscovite, chlorite and beryl, and full analyses for epidote and tourmaline. The sequence of crystallization and the alteration of the minerals are discussed.-R.A.H.},

note = {11},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-0021060250,

title = {Polish with English summary [(Transformations of minerals in pegmatites from Strzegom Lower Silesia.)]},

author = { J. Janeczek},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0021060250&partnerID=40&md5=4fcac0ac782108a68b82d5ad6c060625},

year  = {1983},

date = {1983-01-01},

journal = {Archiwum Mineralogiczne, Polska Akademia Nauk},

volume = {39},

number = {1},

pages = {39-51},

abstract = {A transformation sequence of iron-bearing sheet-silicates is reported from miarolitic pegmatites in granitic rocks near Strzegom: lepidomelane rt arrow Fe-chlorite rt arrow stilpnomelane rt arrow Fe-celadonite (but zinnwaldite, ferrostilpnomelane and ferristilpnomelane also develop). Mention is also made of the development of laumontite from K-feldspar and recognition of pseudomorphs of fluorite after apophyllite.-R.A.H.},

note = {2},

keywords = {},

pubstate = {published},

tppubtype = {article}

}