Sperrylite

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Sperrylite
Category Mineral
Chemical formula PtAs2
Identification
Color tin white
Crystal habit well-formed finely crystalline, massive to reniform
Crystal system cubic
Cleavage cubic indistinct
Fracture conchoidal
Mohs Scale hardness 6 - 7
Luster metallic
Streak black
Specific gravity 10.6

Sperrylite is a platinum arsenide mineral with formula: PtAs2 and is an opaque metallic tin white mineral which crystallizes in the isometric system with the pyrite group structure. It forms cubic, octahedral or pyritohedral crystals in addition to massive and reniform habits. It has a Mohs hardness of 6 - 7 and a very high specific gravity of 10.6.

It was discovered by Francis Louis Sperry, an American chemist, in 1889 at Sudbury.

The most important occurrence of Sperrylite is in the nickel ore deposit of Sudbury Basin in Ontario, Canada. It also occurs in the layered igneous complex of the Bushveld region of South Africa and the Oktyabr'skoye copper-nickel deposit of the Eastern-Siberian Region, Russia.

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