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Formula: Ir2S3
Sulphide of iridium
Crystal System: Orthorhombic
Specific gravity: 9.10 calculated
Hardness: 7½
Colour: Greyish black
Common impurities: Cu,Pt,Ru,Fe
Environments
Kashinite occurs in placer deposits derived from ultramafic
rocks. Associated minerals include iridosmine,
platinum, osmiridium,
laurite, erlichmanite,
cuproiridsite,
cherepanovite,
rhodian pentlandite, irarsite,
an Fe–Pt alloy, sulphides of Fe, Cu, Ir and Rh, and chromite
(HOM).
Localities
At the type locality, the Aleksandrov Log Pt deposit, Soloveva Mountain, Prigorodny District, Sverdlovsk Oblast,
Russia, kashinite occurs as grains, slightly elongated or, more rarely, isometric, with straight, smooth
outlines, from about 10 µm up to few tenths of a millimetre, in placer deposits derived from
ultramafic rocks. Associated minerals include
cherepanovite, chromite,
erlichmanite, irarsite,
iridosmine, laurite,
osmiridium, pentlandite and
platinum
(Mindat).
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