IMA 2022-056 = sidorovite

[Marco E. Ciriotti]

Prossima pubblicazione.

Referenza:
▪ Kutyrev, A., Mcdonald, A.M., Tamura, N., Cabri, L.J., Tolstykh, N., Pekov, I.V. (2023): Sidorovite, PtFe3, A New Mineral from the Snegovaya River Placer, Koryak Highlands, Russia. The Canadian Journal of Mineralogy and Petrology, 61, (in press).

Abstract:
Sidorovite, ideally PtFe3, is a new mineral from the Epilchik ultramafic complex and nearby Snegovaya River placer, Koryak Highlands, Russia. It was found in isoferroplatinum grains extracted from a heavy-mineral concentrate obtained from crushed lode chromitites and alluvial material. Sidorovite occurs either as a part of complex grains comprising tetraferroplatinum, native iron, hollingworthite, magnetite, serpentine, and chromite or as part of secondary rims which formed together with tetraferroplatinum after isoferroplatinum. According to the Laue pattern obtained by synchrotron microdiffraction, sidorovite is cubic, crystallizing in space group Pm3¯m and adopting an Au3Cu-type crystal structure. Its unit-cell parameters are a = 3.725(4) Å, V = 51.687(4) Å3, Z = 1. The calculated density is 11.815 g/cm3. The strongest X-ray diffraction lines are [d (Å) (I, %) (hkl)] 2.161 (100) (111), 3.711 (48) (100), 1.871 (36) (200), 1.673 (27) (210). No cleavage was observed and hardness could not be determined owing to the small size of the grains. The empirical formula of sidorovite calculated based on four atoms is: Pt1.04(Fe2.89Cu0.05Ni0.02)Σ2.96. The mineral is posited to form through the incorporation of Fe0 by tetraferroplatinum, which arises through the reduction of Fe via H2-bearing fluids produced through the serpentinization of olivine at T < 450 °C. The name of the new mineral honors the Russian geologist and mineralogist Evgeniy Gennadievich Sidorov (1955–2021).

NdR: a member of the perovskite supergroup (Fe-analogo della tomamaeite)
Atokite SnPd3 cub Fm3m 3.991 3.991 3.991 90.00 90.00 90.00 1 63.569 auricupride B-site vacant single antiperovskites X□A3 perovskite
Auricupride AuCu3 cub Pm3m 3.753 3.753 3.753 90.00 90.00 90.00 1 52.861 auricupride B-site vacant single antiperovskites X□A3 perovskite
Awaruite FeNi3 cub Pm3m 3.590 3.590 3.590 90.00 90.00 90.00 1 46.268 auricupride B-site vacant single antiperovskites X□A3 perovskite
Chengdeite FeIr3 cub Pm3m 3.792 3.792 3.792 90.00 90.00 90.00 1 54.526 auricupride B-site vacant single antiperovskites X□A3 perovskite
Isoferroplatinum FePt3 cub Pm3m 3.866 3.866 3.866 90.00 90.00 90.00 1 57.781 auricupride B-site vacant single antiperovskites X□A3 perovskite
Rustenburgite SnPt3 cub Fm3m 3.991 3.991 3.991 90.00 90.00 90.00 1 63.569 auricupride B-site vacant single antiperovskites X□A3 perovskite
Sidorovite PtFe3 cub Pm3m 3.725 3.725 3.725 90.00 90.00 90.00 1 51.687 auricupride B-site vacant single antiperovskites X□A3 perovskite
Tomamaeite PtCu3 cub Pm3m 3.683 3.683 3.683 90.00 90.00 90.00 1 49.958 auricupride B-site vacant single antiperovskites X□A3 perovskite
Yixunite InPt3 cub Pm3m 3.988 3.988 3.988 90.00 90.00 90.00 1 63.426 auricupride B-site vacant single antiperovskites X□A3 perovskite
Zvyagintsevite PbPd3 cub Pm3m 4.035 4.035 4.035 90.00 90.00 90.00 1 65.695 auricupride B-site vacant single antiperovskites X□A3 perovskite

[Marco E. Ciriotti]

Pubblicazione effettuata.

Referenza:
▪ Kutyrev, A., Mcdonald, A.M., Tamura, N., Cabri, L.J., Tolstykh, N., Pekov, I.V. (2023): Sidorovite, PtFe3, A New Mineral from the Snegovaya River Placer, Koryak Highlands, Russia. The Canadian Journal of Mineralogy and Petrology, 61, 1021-1030.