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platinum-group metal

Any of the minerals native platinum, osmium, iridium, palladium, rhodium, ruthenium, and their alloys, such as osmiridium (Ir,Os) , ruthenosmiridium (Ir,Os,Ru) , rutheniridosmine (Os,Ir,Ru) , and platiniridium (Ir,Pt) . Other alloys of PGM are exemplified by stanopalliadinite, (Pd,Cu)3Sn2 ; and potarite, PdHg . Other sources of PGM are sperrylite, PtAs2; cooperite, (Pt,Pd,Ni)S; stibiopalladinite, Pd5Sb2; braggite, (Pt,Pd,Ni)S ; vysotskite, (Pd,Ni)S ; ruthenarsenite, (Ru,Ni)As ; cuproiridsite; CuIr2S4; cuprorhodsit, CuRh2S4; malanite, Cu(Pt,Ir)2S4; and dayingite, CuCoPtS4. Varietal terms include plyxene and ferroplatinum for iron alloys and cuproplatinum for copper alloys.

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