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Kufahrite, PtPb, a new mineral from Ledyanoy Creek placer, Galmoenan ultramafic complex, Koryak Highlands, Russia

Published online by Cambridge University Press:  26 February 2021

Evgeniy G. Sidorov Open the ORCID record for Evgeniy G. Sidorov [Opens in a new window] ,
Anton V. Kutyrev Open the ORCID record for Anton V. Kutyrev [Opens in a new window] ,
Elena S. Zhitova Open the ORCID record for Elena S. Zhitova [Opens in a new window] ,
Atali A. Agakhanov ,
Elena I. Sandimirova ,
Anna Vymazalova Open the ORCID record for Anna Vymazalova [Opens in a new window] ,
Valery M. Chubarov  and
Andrey A. Zolotarev Open the ORCID record for Andrey A. Zolotarev [Opens in a new window]
Evgeniy G. Sidorov
Affiliation:
Department of Mineralogy, Institute of Volcanology and Seismology FEB RAS, 9 Piipa boulevard, Petropavlovsk-Kamchatsky, Kamchatsky Krai, 683006, Russia
Anton V. Kutyrev*
Affiliation:
Department of Mineralogy, Institute of Volcanology and Seismology FEB RAS, 9 Piipa boulevard, Petropavlovsk-Kamchatsky, Kamchatsky Krai, 683006, Russia
Elena S. Zhitova
Affiliation:
Department of Mineralogy, Institute of Volcanology and Seismology FEB RAS, 9 Piipa boulevard, Petropavlovsk-Kamchatsky, Kamchatsky Krai, 683006, Russia St. Petersburg State University, University emb., 7/9, St. Petersburg, 199034, Russia
Atali A. Agakhanov
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071Moscow, Russia
Elena I. Sandimirova
Affiliation:
Department of Mineralogy, Institute of Volcanology and Seismology FEB RAS, 9 Piipa boulevard, Petropavlovsk-Kamchatsky, Kamchatsky Krai, 683006, Russia
Anna Vymazalova
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
Valery M. Chubarov
Affiliation:
Department of Mineralogy, Institute of Volcanology and Seismology FEB RAS, 9 Piipa boulevard, Petropavlovsk-Kamchatsky, Kamchatsky Krai, 683006, Russia
Andrey A. Zolotarev
Affiliation:
St. Petersburg State University, University emb., 7/9, St. Petersburg, 199034, Russia
*
*Author for correspondence: Anton V. Kutyrev, Email: [email protected]
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Abstract

Kufahrite, PtPb, is a new mineral (IMA2020-045) from the Ledyanoy Creek placer, Koryak Highlands, Russia. The mineral was found in isoferroplatinum (Pt3Fe) grains extracted from a heavy-mineral concentrate, together with tetraferroplatinum (PtFe), tulameenite (Pt2FeCu), native iridium, hollingworthite (RhAsS) and Cr-rich spinel. Kufahrite occurs as part of alteration rims which are formed together with tetraferroplatinum after isoferroplatinum, or as grains up to 150 μm in size. According to powder X-ray diffraction analyses kufahrite is isotypic to its synthetic analogue, it is hexagonal and crystallises in space group P63/mmc adopting the nickeline structure type. Its unit-cell parameters are: a = 4.2492(6) Å; c = 5.486(6) Å; V = 85.78 Å3 and Z = 2. The calculated density is 14.80 g/cm–3. The strongest diffraction lines are [d, Å (I, %) (hkl)]: 3.052 (80) (101), 2.197 (100) (102), 2.125 (28) (110), 1.747 (18) (210), 1.528 (35) (202), 1.240 (18) (212) and 0.958 (22) (312). The Vickers hardness is 295 kg/mm2 (range 262–320, n = 5), corresponding to a Mohs hardness of 4. The empirical formula of kufahrite, calculated from a mean value of 23 electron-microprobe analyses is (Pt0.94Rh0.04)Σ0.98(Pb0.83Sb0.19)Σ1.02. The name (pronounced as [ku fa rait]) honours Fahrid Shakirovitch Kutyev (1943‒1993), a geologist from the Institute of Volcanology of USSR Academy of Sciences, who played a key role in the discovery of the Koryak–Kamchatka Platinum Belt, including the Ledyanoy Creek placer platinum deposit, where the new mineral has been discovered.

Keywords

new mineralplatinumleadalloyultramaficplacerUral–Alaskan typeGalmoenanPtPbKamchatka
Type
Article
Information
Mineralogical Magazine , Volume 85 , Issue 2 , April 2021 , pp. 254 - 261
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Oleg I Siidra

†

Sadly, since this paper was accepted the first author, Evgeniy G. Sidorov, has passed away.

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