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- Title
Kobyashevite, Cu(SO)(OH)·4HO, a new devilline-group mineral from the Vishnevye Mountains, South Urals, Russia.
- Authors
Pekov, Igor; Zubkova, Natalia; Yapaskurt, Vasiliy; Belakovskiy, Dmitriy; Chukanov, Nikita; Kasatkin, Anatoly; Kuznetsov, Aleksey; Pushcharovsky, Dmitry
- Abstract
A new mineral kobyashevite, Cu(SO)(OH)·4HO (IMA 2011-066), was found at the Kapital'naya mine, Vishnevye Mountains, South Urals, Russia. It is a supergene mineral that occurs in cavities of a calcite-quartz vein with pyrite and chalcopyrite. Kobyashevite forms elongated crystals up to 0.2 mm typically curved or split and combined into thin crusts up to 1 × 2 mm. Kobyashevite is bluish-green to turquoise-coloured. Lustre is vitreous. Mohs hardness is 2½. Cleavage is {010} distinct. D(calc.) is 3.16 g/cm. Kobyashevite is optically biaxial (−), α 1.602(4), β 1.666(5), γ 1.679(5), 2 V(meas.) 50(10)°. The chemical composition (wt%, electron-microprobe data) is: CuO 57.72, ZnO 0.09, FeO 0.28, SO 23.52, HO(calc.) 18.39, total 100.00. The empirical formula, calculated based on 18 O, is: CuFeZnSO(OH)·4HO. Kobyashevite is triclinic, $$ P\overline{\,1 } $$, a 6.0731(6), b 11.0597(13), c 5.5094(6) Å, α 102.883(9)°, β 92.348(8)°, γ 92.597(9)°, V 359.87(7) Å, Z = 1. Strong reflections of the X-ray powder pattern [ d,Å- I( hkl)] are: 10.84-100(010); 5.399-40(020); 5.178-12(110); 3.590-16(030); 2.691-16(20-1, 040, 002), 2.653-12(04-1, 02-2), 2.583-12(2-11, 201, 2-1-1), 2.425-12(03-2, 211, 131). The crystal structure (single-crystal X-ray data, R = 0.0399) сontains [Cu(SO)(OH)] corrugated layers linked via isolated [CuO(HO)] octahedra; the structural formula is CuCu(SO)(OH)·4HO. Kobyashevite is a devilline-group member. It is named in memory of the Russian mineralogist Yuriy Stepanovich Kobyashev (1935-2009), a specialist on mineralogy of the Urals.
- Subjects
MINERALS; CALCITE; CALCITE crystals; QUARTZ; ZINC oxide
- Publication
Mineralogy & Petrology, 2013, Vol 107, Issue 2, p201
- ISSN
0930-0708
- Publication type
Article
- DOI
10.1007/s00710-012-0236-4