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@article{2362478,
author = {Kasatkin, Anatoly V. and Vymazalová, Anna and Nestola, Fabrizio and Gurzhiy, Vladislav V. and Agakhanov, Atali A. and Škoda, Radek and Belakovskiy, Dmitry I. and Generalov, Mikhail E.},
article_location = {London},
article_number = {5},
doi = {http://dx.doi.org/10.1180/mgm.2023.73},
keywords = {stannopalladinite; optical properties; chemical formula; X-ray data; Ugol'nyi Ruchei; Norilsk deposit; Pd-Sn; Pd-Cu-Sn systems},
language = {eng},
issn = {0026-461X},
journal = {Mineralogical Magazine},
title = {A re-evaluation of stannopalladinite using modern analytical techniques},
url = {https://doi.org/10.1180/mgm.2023.73},
volume = {87},
year = {2023}
}
TY - JOUR
ID - 2362478
AU - Kasatkin, Anatoly V. - Vymazalová, Anna - Nestola, Fabrizio - Gurzhiy, Vladislav V. - Agakhanov, Atali A. - Škoda, Radek - Belakovskiy, Dmitry I. - Generalov, Mikhail E.
PY - 2023
TI - A re-evaluation of stannopalladinite using modern analytical techniques
JF - Mineralogical Magazine
VL - 87
IS - 5
SP - 773-782
EP - 773-782
PB - Mineralogical Society
SN - 0026461X
KW - stannopalladinite
KW - optical properties
KW - chemical formula
KW - X-ray data
KW - Ugol'nyi Ruchei
KW - Norilsk deposit
KW - Pd-Sn
KW - Pd-Cu-Sn systems
UR - https://doi.org/10.1180/mgm.2023.73
N2 - An investigation of sample 41647 from the Platinum Placer of Ugol'nyi Ruchei, Norilsk Cu–Ni deposit, Russia, stored in the systematic collection of the Fersman Mineralogical Museum, revealed that it contained a mineral that can be identified as the original stannopalladinite described in 1947. As the literature information on the latter is controversial, the mineral was re-investigated using modern analytical techniques. Stannopalladinite occurs as spherical and ovoid-shaped grains up to 0.08 mm, closely intergrown with tetraferroplatinum as part of flattened, prismatic crystals up to 6 mm long. The micro-indentation hardness of stannopalladinite (VHN, 30 g load) is 244 kg/mm2 (range 233–266, n = 4), corresponding to a Mohs hardness of 4. The calculated density is 9.781 g/cm3. In reflected light, stannopalladinite is pale pink. The bireflectance is noticeable only in oil immersion. In crossed nicols the mineral exhibits strong anisotropy with colour effects changing from reddish purple to greyish blue and polysynthetic twinning of grains. The reflectance curves show distinct anomalous dispersion. The chemical composition (wt.%, electron microprobe data, mean of 11 analyses) is: Cu 8.48, Pd 61.21, Pt 0.89, Sn 25.87, Pb 3.70, total 100.15. The empirical formula calculated on the basis of 4 atoms per formula unit is (Pd2.42Cu0.56Pt0.02)Σ3.00(Sn0.92Pb0.08)Σ1.00. The ideal chemical formula of stannopalladinite is therefore proposed as (Pd,Cu)3Sn instead of Pd3Sn2 used in the official IMA List of Minerals. The strongest powder X-ray diffraction lines are [dobs, Å (I, %) (hkl) ]: 2.292 (42) (231), 2.166 (100) (331), 2.034 (10) (710), 1.916 (15) (141) and 1.851 (15) (630). The powder X-ray data are indexed in the orthorhombic unit cell with a = 14.634(2), b = 8.5253(6), c = 4.5946(3) Å and V = 573.24(7) Å3 (Z = 8). Stannopalladinite can be reliably identified among all other minerals belonging to the binary Pd–Sn and ternary Pd–Cu–Sn systems by a combination of chemical, optical and X-ray data.
ER -
KASATKIN, Anatoly V., Anna VYMAZALOVÁ, Fabrizio NESTOLA, Vladislav V. GURZHIY, Atali A. AGAKHANOV, Radek ŠKODA, Dmitry I. BELAKOVSKIY a Mikhail E. GENERALOV. A re-evaluation of stannopalladinite using modern analytical techniques. \textit{Mineralogical Magazine}. London: Mineralogical Society, 2023, roč.~87, č.~5, s.~773-782. ISSN~0026-461X. Dostupné z: https://dx.doi.org/10.1180/mgm.2023.73.
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