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Formula: (Ir,Os,Ru)
Alloy of iridium, osmium and
ruthenium
Crystal System: Hexagonal
Hardness: 6 to 7
Colour: Silver-white
Common impurities: Pt,Pd,Rh,Fe,Ni
Environments
Rutheniridosmine occurs in placer sands, generally derived from ultramafic rocks. Associated
minerals include other osmium –
iridium – ruthenium alloys,
sperrylite,
hollingworthite,
iridarsenite,
ruthenarsenite,
michenerite, laurite,
geversite, moncheite and
chromite
(HOM).
Localities
There are four co-type localities:
Spruce Creek, Atlin Mining Division, British Columbia, Canada
Ruby Creek, Surprise Lake, Atlin Mining Division, British Columbia, Canada
Bullion Pit, Likely, Cariboo Mining Division, British Columbia, Canada
Horokanai placer, Uryugawa, Uryu District, Kamikawa Subprefecture, Hokkaidō Prefecture, Japan
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