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
Erlichmanite
Natural osmium disulfide — a gray metallic mineral found in noble-metal placer deposits.
Intro adapted from Wikipedia (CC BY-SA).
Erlichmanite is an IMA-recognized mineral species in the sulfide class, with the chemical formula OsS₂.
It crystallizes in the cubic crystal system (space group Pa3). It is a member of the Pyrite structural group.
Key properties: specific gravity 8.28; Metallic. R: (400) 44.4, (420) 44.2, (440) 44.0, (460) 43.8, (480) 43.4, (500) 43.0, (520) 42.7, (540) 42.2 luster.
IMA symbol Erl, IMA status: approved, named in 1970.
is typically found in PGM placers, likely derived from chromitites in association with ophiolites and other Alaskan-type ultramafic complexes.
It is found associated with Pt–Fe alloy, platinum, osmium, laurite, hollingworthite, irarsite, many other PGM alloys and sulfides.
The name refers to Jozef Erlichman (1935–), American electron probe analyst, Planetary Branch, NASA-Ames Research Branch, who analyzed a number of new minerals.