Minerals identify

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Polydymite

Sulfide mineral,thiospinel group,spinel structural group

Polydymite, Ni2+Ni23+S4, is a supergene thiospinel associated with the weathering of primary pentlandite nickel sulfide.

Polydymite crystallises in the isometric system, with a hardness of 4.5 to 5.5 and a specific gravity of about 4, is dark violet gray to copper-red, often with verdigris and patina from associated copper and arsenic sulfides, and is typically in amorphous to massive infill of lower saprolite.

Polydymite is the nickel equivalent of violarite and in many cases these two minerals are formed together, potentially in solid solution.

Common contaminants of polydymite are cobalt and iron. Polydymite forms a series with linnaeite

Identification

Color of mineral

Grey

Mohs scale ( mineral hardness )

4.5

Luster ( interacts light )

Metallic

Crystal ( diaphaneity )

Cubic