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Sluzhenikinite, Pd15(Sb7-xSnx) 3 ≤ x ≤ 4, a new platinum group mineral (PGM) from the Oktyabrsk deposit, the Noril`sk deposits, Russia

Part of: Minerals, crystal structures and geochemistry - Peter Williams special issue

Published online by Cambridge University Press:  22 December 2021

Anna Vymazalová Open the ORCID record for Anna Vymazalová [Opens in a new window] ,
Mark D. Welch ,
František Laufek ,
Vladimir V. Kozlov Open the ORCID record for Vladimir V. Kozlov [Opens in a new window] ,
Chris J. Stanley  and
Jakub Plášil Open the ORCID record for Jakub Plášil [Opens in a new window]
Anna Vymazalová*
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
Mark D. Welch
Affiliation:
Department of Earth Sciences, Natural History Museum, London, SW7 5BD, UK
František Laufek
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
Vladimir V. Kozlov
Affiliation:
Oxford Instruments (Moscow Office), 26, Denisovskii Pereulok, Moscow, 105005, Russia
Chris J. Stanley
Affiliation:
Department of Earth Sciences, Natural History Museum, London, SW7 5BD, UK
Jakub Plášil
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, 128 21 Prague 8, Czech Republic
*
*Author for correspondence: Anna Vymazalová, Email: anna.vymazalova@geology.cz
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Abstract

Sluzhenikinite, Pd15(Sb7–xSnx) with 3 ≤ x ≤ 4, is a new mineral discovered in the pegmatoidal galena–chalcopyrite massive ore from the Oktyabrsk mine, Oktyabrsk deposit of the Noril`sk deposits, Russia. Sluzhenikinite forms euhedral elongate lamellar crystals (100–150 μm long and 10–50 μm wide) associated with Au–Ag alloy, insizwaite and myrmekitic intergrowths of Pt–Pd minerals (stibiopalladinite, maslovite and sobolevskite), in close association of sperrylite and base-metal sulfides (galena, chalcopyrite, cubanite and pentlandite). In plane-polarised light, sluzhenikinite is pale brown with weak bireflectance, imperceptible pleochroism, and weak anisotropy with straw yellow to deep blue rotation tints; it exhibits no internal reflections. Reflectance values for sluzhenikinite in air (R1,R2 in %) are: 46.2, 46.5 at 470nm; 52.1, 52.2 at 546nm; 54.7, 55.1 at 589nm; and 57.8, 59.0 at 650nm. Thirteen electron-microprobe analyses of sluzhenikinite gave an average composition: Pd 65.06, Sn 15.60 and Sb 19.58, total 100.24 wt.%, corresponding to the formula Pd14.88(Sb3.92Sn3.20)Σ7.12 based on 22 atoms; the average of twenty-one energy dispersive spectroscopy analyses on co-type material gave: Pd 63.36, Pt 1.15, Sn 16.28 and Sb 19.21, total 100.00 wt.%, corresponding to the formula (Pd14.62Pt0.14)Σ14.76(Sb3.87Sn3.37)Σ7.24. The density, calculated on the basis of the empirical formula, is 11.22 g/cm3. The mineral is monoclinic, space group P21/m, with a = 7.5558(1), b = 29.2967(3), c = 7.5713(1) Å, β = 119.931(2)°, V = 1452.44(4) Å3 and Z = 4. The crystal structure was determined using data from single-crystal X-ray diffraction and demonstrates conclusively that the correct stoichiometry is Pd15(Sb,Sn)7, rather than Pd2(Sb,Sn); R1 = 0.035, wR2 = 0.073, GoF = 1.118 for 209 refined parameters and 4738 unique reflections. The mineral is named after Sergey Fedorovich Sluzhenikin, an expert on platinum-group minerals, particularly from the area of the type locality.

Keywords

sluzhenikiniteplatinum-group mineralPd15(Sb7–xSnx)Oktyabrsk mineOktyabrsk depositNoril`sk depositsRussia
Type
Article
Information
Mineralogical Magazine , Volume 86 , Issue 4 , August 2022 , pp. 577 - 585
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

This paper is part of a thematic set that honours the contributions of Peter Williams

Associate Editor: David Hibbs

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