Color is tin white. Luster is metallic. Crystals are opaque. Crystals with combinations of these forms are more common. Also massive and reniform.
Fracture is conchoidal.
Brittle, striations on cubic faces caused by crossing of pyritohedron with cube. Associated Minerals are chalcopyrite , pyrrhotite and pentlandite . Notable Occurrences include Sudbury, Ontario, Canada and the Bushveld rocks of Transvaal, South Africa. Best Field Indicators are crystal habit, hardness, luster, associations, color and lack of good cleavage.