Cooperite is a grey mineral consisting of platinum sulfide (PtS), generally in combinations with sulfides of other elements such as palladium and nickel (PdS and NiS). Its general formula is (Pt,Pd,Ni)S. It is a dimorph of braggite. It is mined as an ore of platinum and platinum group metals such as palladium. It occurs in South Africa in minable ...
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http://en.wikipedia.org/wiki/Cooperite
a mineral, sulfide and arsenide of platinum, occurring in igneous rocks in the form of steel-gray crystals.
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