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Kobyashevite, Cu5(SO4)2(OH)6·4H2O, a new devilline-group mineral from the Vishnevye Mountains, South Urals, Russia

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Abstract

A new mineral kobyashevite, Cu5(SO4)2(OH)6·4H2O (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/cm3. 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, SO3 23.52, H2O(calc.) 18.39, total 100.00. The empirical formula, calculated based on 18 O, is: Cu4.96Fe0.03Zn0.01S2.01O8.04(OH)5.96·4H2O. 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) Å3, 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 [Cu4(SO4)2(OH)6] corrugated layers linked via isolated [CuO2(H2O)4] octahedra; the structural formula is CuCu4(SO4)2(OH)6·4H2O. 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.

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Notes

  1. In some papers the name “strandbergite” is used for this compound formed in the result of corrosion of artificial metallic objects containing copper (He 2002).

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Acknowledgments

This paper is dedicated to Josef Zemann for his contribution in the crystal chemistry of supergene minerals, including copper sulfates.

We are grateful to two anonymous referees and the editor Herta Effenberger for useful comments. Our work was supported by the Russian Foundation for Basic Research, grants nos. 11-05-00397-a, 11-05-00407-a and 12-05-00250-а, and by the Foundation of the President of the Russian Federation, grant no. NSh-2883.2012.5. X-ray powder-diffraction study was carried out in the SPbSU X-ray Diffraction Resource Center.

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Authors and Affiliations

  1. Faculty of Geology, Moscow State University, Vorobievy Gory, 119991, Moscow, Russia

    Igor V. Pekov, Natalia V. Zubkova, Vasiliy O. Yapaskurt & Dmitry Y. Pushcharovsky

  2. Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071, Moscow, Russia

    Dmitriy I. Belakovskiy

  3. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Oblast, Russia

    Nikita V. Chukanov

  4. V/O “Almazjuvelirexport”, Ostozhenka Str., 22, Block 1, 119034, Moscow, Russia

    Anatoly V. Kasatkin

  5. Oktyabrskaya Str., 5-337, 454071, Chelyabinsk, Russia

    Aleksey M. Kuznetsov

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  1. Igor V. Pekov
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  2. Natalia V. Zubkova
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Correspondence to Igor V. Pekov.

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Editorial handling: H. Effenberger

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Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O. et al. Kobyashevite, Cu5(SO4)2(OH)6·4H2O, a new devilline-group mineral from the Vishnevye Mountains, South Urals, Russia. Miner Petrol 107, 201–210 (2013). https://doi.org/10.1007/s00710-012-0236-4

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