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Vymazalováite, Pd3Bi2S2, a new mineral from the Noril'sk-Talnakh deposit, Krasnoyarskiy region, Russia

Published online by Cambridge University Press:  28 February 2018

Sergei F. Sluzhenikin ,
Vladimir V. Kozlov ,
Chris J. Stanley ,
Maria L. Lukashova  and
Keith Dicks
Sergei F. Sluzhenikin
Affiliation:
Institute of Geology of Ore Deposits, Mineralogy, Petrography and Geochemistry RAS, Staromonetnyi per. 12, Moscow, 119 017, Russia
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
Maria L. Lukashova
Affiliation:
Tescan CIS Ltd., Grazhdansky pr.11., St.Petersburg, 195220, Russia
Keith Dicks
Affiliation:
Oxford Instruments plc., Halifax Road, High Wycombe, Bucks HP12 3SE, UK
*
*E-mail: C.Stanley@nhm.ac.uk
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Abstract

Vymazalováite, Pd3Bi2S2 is a new platinum-group mineral discovered in the Komsomolsky mine of the Talnakh deposit, Noril'sk district, Russia. It forms small (from a few μm to 20–35 µm) inclusions or euhedral grains in intergrowths of polarite, sobolevskite, acanthite and unnamed (Pd,Ag)5BiS2 in aggregates (up to ~200 µm) in galena and rarely in chalcopyrite. It occurs with telargpalite, cooperite, braggite, vysotskite, sopcheite, stibiopalladinite, sobolevskite, moncheite, kotulskite, malyshevite, insizwaite, Au-bearing silver and the newly described mineral kravtsovite (PdAg2S) in association with pyrite, chalcopyrite and galena in vein-disseminated mineralization in skarn rocks. Synthetic vymazalováite is brittle; it has a metallic lustre and a grey streak. In plane-polarized reflected light, vymazalováite is creamy grey and appears slightly brownish against galena in the assemblage with chalcopyrite. It exhibits no internal reflections. Average reflectance values in air for natural and synthetic vymazalováite are (R natural, R synthetic in %) are: 46.35, 45.7 at 470 nm, 47.65, 47.45 at 546 nm, 48.5, 48.2 at 589 nm and 49.5, 49.0 at 650 nm. Seven electron probe micro-analyses of vymazalováite give an average composition: Pd 40.42, Bi 49.15, Ag 0.55, Pb 1.02, S 7.77 and Se 0.26, total 99.17 wt.%, corresponding to the empirical formula Pd3.05(Bi1.89Ag0.04Pb0.04)Σ1.97(S1.95Se0.03)Σ1.98 based on a total of 7 atoms per formula unit. The simplified formula is Pd3Bi2S2. The mineral is cubic, space group I213, with a = 8.3097(9) Å, V = 573.79(1) Å3 and Z = 4. The density calculated on the basis of the empirical formula and cell dimensions of synthetic vymazalováite is 9.25 g/cm3. The strongest lines in the powder X-ray diffraction pattern of synthetic vymazalováite [d in Å (I) (hkl)] are: 4.15(32)(200), 2.93(78)(220), 2.40(100)(220), 2.08(53)(400), 1.695(34)(422), 1.468(35)(440) and 1.252(31)(622). The structural identity of natural vymazalováite with synthetic Pd3Bi2S2 was confirmed by electron back-scatter diffraction measurements on the natural sample. This new mineral honours Dr Anna Vymazalová of the Czech Geological Survey, Prague.

Keywords

vymazalováiteplatinum-group mineralPd3Bi2S2 phaseelectron-microprobe datareflectance dataX-ray-diffraction datacrystal structureKomsomolsky mineTalnakh depositNoril'sk districtRussia
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 2 , April 2018 , pp. 367 - 373
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Ed Grew

References

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