A lot of single nuggets embedded in epoxy resin of the intermediate member between kashinite (Ir2S3) erlichmannite (OsS2) ans laurite (RuS2) in a completely analyzed specimen by SEM/EDS. From: Miass River, Chelyabinsk Oblast, Russian Federation. Three extremely rare sulphides in a single sample! Some nuggets are almost pure members, and other are intermediate members like in the spectrum provided. Note.- IMA formula for kashinite don't include Rh, like this sample. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Kashinite
Kashinite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Ir₂S₃.
It crystallizes in the orthorhombic crystal system (space group Pbcn). It is a member of the Bowieite structural group.
Key properties: specific gravity 9.1; Metallic luster.
IMA symbol Ksh, IMA status: approved, named in 1982.
Found in placer deposits derived from ultramafic rocks.
It is found associated with Iridosmine, platinum, osmiridium, laurite, erlichmanite, cuproiridisite, cherepanovite, rhodian pentlandite, irarsite, Fe–Pt alloy, sulfides of Fe, Cu, Ir, Rh.
The mineral was named to honor Stepan Aleksandrovich Kashin (1900–1981), Central Institute of Geological Exploration for Base and Precious Metals, Moscow, Russia.