@article{2-s2.0-85062965884,

title = {New minerals with modular structure derived from hatrurite from the pyrometamorphic rocks. Part IV: Dargaite, BaCa12(SiO4)4(SO4)2O3, from Nahal Darga, Palestinian Autonomy},

author = { I.O. Galuskina and F. Gfeller and E.V. Galuskin and T.M. Armbruster and Y. Vapnik and M. Dulski and M. Gardocki and L. Jeżak and M.N. Murashko},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85062965884&doi=10.1180%2fminmag.2017.081.095&partnerID=40&md5=a30918086875a41b951988ec853674f9},

doi = {10.1180/minmag.2017.081.095},

issn = {0026461X},

year  = {2019},

date = {2019-01-01},

journal = {Mineralogical Magazine},

volume = {83},

number = {1},

pages = {81-88},

publisher = {Cambridge University Press},

abstract = {Dargaite, ideally BaCa12(SiO4)4(SO4)2O3, is an additional member of the arctite group belonging to minerals with a modular intercalated antiperovskite structure derived from hatrurite. The holotype specimen was found at a small outcrop of larnite pseudoconglomerates in the Judean Mts, West Bank, Palestinian Autonomy. Larnite, fluorellestadite-fluorapatite, brownmillerite, fluormayenite-fluorkyuygenite and ye'elimite are the main minerals of the holotype specimen; ternesite, shulamitite and periclase are noted rarely. Dargaite, nabimusaite and gazeevite occur in linear zones with higher porosity within larnite rocks. Pores are filled with ettringite and Ca-hydrosilicates, less commonly with gibbsite, brucite, baryte, katoite and calciolangbeinite. Dargaite is colourless, transparent with a white streak and has a vitreous lustre. It exhibits pronounced parting and imperfect cleavage along (001). Mohs' hardness is ~4.5-5.5. The empirical formula is (Ba0.72K0.24Na0.04)Σ1(Ca11.95Mg0.04Na0.01)Σ12([SiO4]0.91 [PO4]0.05[AlO4]0.03[Ti4+O4]0.01)Σ4([SO4]0.84[PO4]0.14[CO3]0.02)Σ2(O2.54F0.46)Σ3. Dargaite is trigonal Rm, the unit-cell parameters are: a = 7.1874(4) Å},

note = {4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85021137837,

title = {New minerals with a modular structure derived from hatrurite from the pyrometamorphic rocks. Part III. Gazeevite, BaCa6(SiO4)2(SO4)2O, from Israel and the Palestine Autonomy, South Levant, and from South Ossetia, Greater Caucasus},

author = { E.V. Galuskin and F. Gfeller and I.O. Galuskina and T.M. Armbruster and A. Krzątała and Y. Vapnik and J. Kusz and M. Dulski and M. Gardocki and A.G. Gurbanov and P. Dzierzanowski},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85021137837&doi=10.1180%2fminmag.2016.080.105&partnerID=40&md5=a3eaf4dbf264465c2637bf98d1c5560a},

doi = {10.1180/minmag.2016.080.105},

issn = {0026461X},

year  = {2017},

date = {2017-01-01},

journal = {Mineralogical Magazine},

volume = {81},

number = {3},

pages = {499-513},

publisher = {Mineralogical Society},

abstract = {The new mineral gazeevite, BaCa6(SiO4)2(SO4)2O (R3m; a = 7.1540(1); c = 25.1242(5) Å; V = 1113.58(3) Å3; Z = 3), was found in an altered xenolith in rhyodacites of the Shadil-Khokh volcano, Southern Ossetia and at three localities in larnite pyrometamorphic rocks of the Hatrurim Complex; Nahal Darga and Jabel Harmun, Judean Mountains, Palestinian Autonomy, and Har Parsa, Negev Desert, Israel. Larnite, fluorellestadite-fluorapatite, srebrodolskite-brownmillerite andmayenite-supergroup minerals are the main minerals commonly associated with gazeevite. Gazeevite is isostructural with zadovite and aradite; the 1:1 type AB6(TO4)2(TO4)2W, occurs together with the structurally related minerals of the nabimusaite series, 3:1 type AB12(TO4)4(TO4)2W3, where A = Ba, K, Sr...; B=Ca, Na...; T = Si, P, V5+, S6+, Al...; W=O2-, F-. Single antiperovskite layers {[WB6](TO4)2} in the structure type of gazeevite-zadovite and triple {[W3B12] (TO4)4} layers in arctite-nabimusaite are intercalated with single A(TO4) layers. These minerals with an interrupted antiperovskite structure are characterized by a modular layered structure derived from hatrurite, Ca3(SiO4)O. Gazeevite is colourless, transparent, with a white streak and vitreous lustre. Gazeevite is brittle, shows pronounced parting and imperfect cleavage on {001}; it is uniaxial (-), ω = 1.640(3), ϵ = 1.636(2) (λ = 589 nm) and nonpleochroic; Mohs' hardness is ~4.5},

note = {17},

keywords = {},

pubstate = {published},

tppubtype = {article}

}