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Svetlanaite, SnSe, a new mineral from the Ozernovskoe deposit, Kamchatka peninsula, Russia

Published online by Cambridge University Press:  17 February 2022

Victor M. Okrugin ,
Anna Vymazalová Open the ORCID record for Anna Vymazalová [Opens in a new window] ,
Vladimir V. Kozlov Open the ORCID record for Vladimir V. Kozlov [Opens in a new window] ,
František Laufek ,
Chris J. Stanley  and
Ilya A. Shkilev
Victor M. Okrugin
Affiliation:
Institute of Volcanology and Seismology, Russian Academy of Science, Petropavlovsk-Kamchatsky, 683006, Russia
Anna Vymazalová*
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague, Czech Republic
Vladimir V. Kozlov
Affiliation:
Oxford Instruments (Moscow Office), 26, Denisovskii Pereulok, Moscow, 105005, Russia
František Laufek
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague, Czech Republic
Chris J. Stanley
Affiliation:
Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK
Ilya A. Shkilev
Affiliation:
JSC “Siberian Mining and Metallurgical Alliance”, Mishennaya 106, Petropavlovsk-Kamchatsky, Kamchatka Territory, 683016, Russia
*
*Author for correspondence: Anna Vymazalová, Email: [email protected]
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Abstract

Svetlanaite, SnSe is a new mineral discovered from the high-sulfidation epithermal Au-deposit Ozernovskoe, Kamchatka peninsula, Russia. It forms tiny euhedral spindles (0.5–2 μm × 10–15 μm) in quartz, in close association with cassiterite, rutile, mohite, mawsonite, kiddcreekite, hemusite, tellurium, kostovite and Se-bearing ‘fahlores’ (Se-goldfieldite–Se(Bi)-tetrahedrite–Se-tennantite). In plane-polarised light, svetlanaite is light-grey, pleochroic from white to cream and strongly anisotropic in shades of light blue, dark blue, khaki and orange–brown; it exhibits no internal reflections. Reflectance values of synthetic analogue of svetlanaite in air (R1,R2 in %) are: 50.9, 56.5 at 470 nm, 50.2, 56.7 at 546 nm, 49.5, 55.3 at 589 nm and 48.7, 53.4 at 650 nm. Twelve electron-microprobe analyses of svetlanaite give an average composition: Sn 61.30, Se 37.22 and S 1.25 total 99.79 wt.%, corresponding to the empirical formula Sn1.01(Se0.92S0.07)Σ0.99 based on 2 atoms; the average of seven analyses on its synthetic analogue is: Sn 59.98 and Se 39.71, total 99.59 wt.%, corresponding to Sn1.00Se1.00. The density, calculated on the basis of the empirical formula, is 6.08 g/cm3. The mineral is orthorhombic, space group Pnma, with a = 11.500(2), b = 4.154(2), c = 4.445(2) Å, V = 212.34(14) Å3 and Z = 4. The crystal structure was solved and refined from the powder X-ray-diffraction data of synthetic SnSe. It crystallises in the GeS-structure type. It is isostructural with the mineral herzenbergite (SnS). The mineral name is in honour of Svetlana K. Smirnova, a Russian mineralogist, for her contributions to geology in the epithermal Au–Ag deposits of the Tien–Shan region.

Keywords

svetlanaiteSnSeelectron-microprobe datareflectance dataX-ray-diffraction datacrystal structureOzernovskoe depositKamchatkaRussia
Type
Article
Information
Mineralogical Magazine , Volume 86 , Issue 2 , April 2022 , pp. 234 - 242
Copyright
Copyright © Czech Geological Survey, Oxford Instruments, Natural History Museum, JSC Siberian Mining and Metallurgical Alliance, and Institute of Volcanology and Seismology, Russian Academy of Science, 2022. Published by Cambridge University Press on behalf of the Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Elena Zhitova

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