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Formula: (Ru,Ni)As
Arsenide of ruthenium and
nickel
Crystal System: Orthorhombic
Specific gravity: 10.0 calculated for the empirical formula
Hardness: 6 to 6½:
Colour: Light brown
Common impurities: Ir,Os,Pt,Rh,Pd,Sb
Environments
Plutonic igneous environments
Placer deposits
Ruthenarsenite occurs as inclusions in osmium -
iridium - ruthenium alloys, and in
Alpine-type ultramafics. Associated minerals iclude
rutheniridosmine, irarsite
and iridarsenite
(HOM).
Localities
At the type locality, the Waria River, Ioma area, Oro Province, Papua New Guinea, ruthenarsenite occurs as
irregular inclusions up to 100 microns across in a matrix of
rutheniridosmine which also contains inclusions of
irarsite
and iridarsenite
(CM 12.280-284).
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