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Formula: OsS2
Sulphide of osmium, pyrite group,
forms a series
with laurite
Crystal System: Isometric
Specific gravity: 8.28 measured, 9.59 calculated
Hardness: 4½ to 5½
Colour: Grey
Common impurities: Ir,Rh,Ru,Pd
Environments
Erlichmanite occurs typically in platinum group mineral
placers, likely derived
from chromitites associated with
ophiolites and other ultramafic
complexes. Associated minerals include a
platinum-iron alloy,
platinum, osmium,
laurite, hollingworthite,
irarsite and many other
platinum group mineral
alloys and sulphides
(HOM).
Localities
The type locality is the MacIntosh mine, Willow Creek, Willow Creek Mining District, Klamath Mountains, Humboldt county,
California, USA.
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