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Formula: IrAs2
Arsenide of iridium
Crystal System: Monoclinic
Specific gravity: 10.9 calculated
Hardness: 5 to 5½
Common impurities: Os,Pt,Rh,Pd,S
Environments
Iridarsenite occurs in nuggets or fragments of natural Os–Ir–Ru alloys, associated with
irarsite, ruthenarsenite
and rutheniridosmine
(HOM).
Localities
At the type locality, the Waria River, Ioma area, Oro Province, Papua New Guinea, iridarsenite occurs as
irregular inclusions up to 60 microns across in a matrix of
rutheniridosmine associated with
ruthenarsenite
(CM.2.280-284).
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