Images
Formula: OsAsS
Sulphide, arsenopyrite group,
osmium- and arsenic- bearing
mineral
Crystal System: Monoclinic
Specific gravity: 8.44 calculated
Hardness: 6
Colour: Grey
Common impurities: Ir,Pd,Pt,Rh,Ni,Fe,Co
Environments
Localities
At the type locality, Gold Bluff beach, Gold Bluffs, Orick, Orick Mining District, Humboldt County,
California, USA, osarsite occurs in a platinum-bearing sample
of placer sand.
Associated minerals include irarsite,
ruthenarsenite,
sperrylite,
iridarsenite,
osmiridium, anduoite,
laurite and ruarsite
(HOM).
Back to Minerals