| Reference Type | Journal (article/letter/editorial) |
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| 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 |
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| Journal | Mineralogical Magazine |
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| Authors | Galuskina, Irina O. | Author |
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| Gfeller, Frank | Author |
| Galuskin, Evgeny V. | Author |
| Armbruster, Thomas | Author |
| Vapnik, Yevgeny | Author |
| Dulski, Mateusz | Author |
| Gardocki, Mariusz | Author |
| Jeżak, Lidia | Author |
| Murashko, Mikhail | Author |
| Year | 2019 (February) | Volume | 83 |
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| Page(s) | 81-88 | Issue | 1 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM83_81.pdf+ |
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| DOI | doi:10.1180/minmag.2017.081.095Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 245115 | Long-form Identifier | mindat:1:5:245115:6 |
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| GUID | 149015b8-f872-4dad-979d-024484a7f4c2 |
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| Full Reference | Galuskina, Irina O., Gfeller, Frank, Galuskin, Evgeny V., Armbruster, Thomas, Vapnik, Yevgeny, Dulski, Mateusz, Gardocki, Mariusz, Jeżak, Lidia, Murashko, Mikhail (2019) 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. Mineralogical Magazine, 83 (1) 81-88 doi:10.1180/minmag.2017.081.095 |
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| Plain Text | Galuskina, Irina O., Gfeller, Frank, Galuskin, Evgeny V., Armbruster, Thomas, Vapnik, Yevgeny, Dulski, Mateusz, Gardocki, Mariusz, Jeżak, Lidia, Murashko, Mikhail (2019) 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. Mineralogical Magazine, 83 (1) 81-88 doi:10.1180/minmag.2017.081.095 |
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| Abstract/Notes | 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 R$\overline 3 $m, the unit-cell parameters are: a = 7.1874(4) Å, c = 41.292(3) Å, V = 1847.32(19) Å3 and Z = 3. The crystal structure of dargaite was refined from X-ray single-crystal data to R1 = 3.79%. The calculated density is 3.235 g cm–3. The following main Raman bands are distinguished on the holotype dargaite (cm–1): 122, 263, 323, 464, 523, 563, 641 and 644, 829 and 869, 947, 991 and 1116. The formation conditions of dargaite are linked to the local occurrence of pyrometamorphic by-products (gases, fluids and melts) transforming earlier mineral associations at ~900°C. |
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