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Panskyite, Pd9Ag2Pb2S4, a new platinum group mineral from the Southern Kievey ore occurrence of the Fedorova–Pana layered intrusion, Kola Peninsula, Russia

Published online by Cambridge University Press:  21 December 2020

Anna Vymazalová Open the ORCID record for Anna Vymazalová [Opens in a new window] ,
Viktor V. Subbotin ,
František Laufek ,
Yevgeny E. Savchenko ,
Chris J. Stanley ,
Dmitriy A. Gabov  and
Jakub Plášil
Anna Vymazalová*
Affiliation:
Czech Geological Survey, Geologická 6, 152 00Prague, Czech Republic
Viktor V. Subbotin
Affiliation:
Geological Institute, Kola Science Centre of the Russian Academy of Sciences, 184209Apatity, Russia
František Laufek
Affiliation:
Czech Geological Survey, Geologická 6, 152 00Prague, Czech Republic
Yevgeny E. Savchenko
Affiliation:
Geological Institute, Kola Science Centre of the Russian Academy of Sciences, 184209Apatity, Russia
Chris J. Stanley
Affiliation:
Department of Earth Sciences, Natural History Museum, LondonSW7 5BD, UK
Dmitriy A. Gabov
Affiliation:
Geological Institute, Kola Science Centre of the Russian Academy of Sciences, 184209Apatity, Russia
Jakub Plášil
Affiliation:
Institute of Physics, AS CR v.v.i. Na Slovance 2, 182 21, Prague 8, Czech Republic
*
*Author for correspondence: Anna Vymazalová, Email: anna.vymazalova@geology.cz
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Abstract

Panskyite, Pd9Ag2Pb2S4, is a new mineral (IMA2020–039) discovered in the platinum-group element mineralisation of the Southern Kievey ore occurrence of the Fedorova–Pana layered intrusion, Kola Peninsula, Russia. It forms tiny anhedral grains (of 0.5 to 10 μm in size) in the interstices of rock-forming silicates, often forming tiny inclusions in base-metal sulfides (millerite, chalcopyrite, bornite and chalcocite) and complex intergrowths with other platinum group minerals (zvyagintsevite, laflammeite, vysotskite, thalhammerite, unnamed phase Pd9Ag2(Tl,Pb)2S4 and others). In plane-polarised light, panskyite is creamy white with weak bireflectance, weak pleochroism and distinct anisotropy with brown to grey rotation tints; it exhibits no internal reflections. Reflectance values for panskyite in air (R1, R2 in %) are: 43.8, 44.1 at 470 nm; 44.4, 44.7 at 546 nm; 45.6, 45.8 at 589 nm; and 47.2, 47.2 at 650 nm. Twelve electron-microprobe analyses of panskyite gave an average composition: Pd 55.61, Ag 12.36, Pb 23.50, Fe 0.21, Ni 0.24 and S 7.17 total 99.09 wt.%, corresponding to the formula (Pd9.05Fe0.07Ni0.07)Σ9.19Ag1.98Pb1.96S3.87 based on 17 atoms; the average of nine analyses on the synthetic analogue is: Pd 57.02, Ag 14.17, Pb 21.81 and S 7.44, total 100.44 wt.%, corresponding to Pd9.07Ag2.22Pb1.78S3.93. The density, calculated on the basis of the empirical formula, is 9.81 g/cm3. The mineral is tetragonal, space group I4/mmm, with a = 7.973(3), c = 9.139(3) Å, V = 581.0(4) Å3 and Z = 2. The crystal structure was solved from the single-crystal and powder X-ray diffraction data of synthetic Pd9Ag2Pb2S4. Panskyite is isostructural with thalhammerite (Pd9Ag2Bi2S4). The mineral name is for the locality, the Pansky massif of the Fedorova–Pana layered intrusion in the Kola Peninsula, Russia.

Keywords

panskyiteplatinum-group mineralPd9Ag2Pb2S4Fedorova–Pana layered intrusionKola PeninsulaRussia
Type
Article
Information
Mineralogical Magazine , Volume 85 , Issue 2 , April 2021 , pp. 161 - 171
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Peter Leverett

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