Bismuthide, pyrite group
Specific gravity: 12.8 calculated
Hardness: 5 to 5½
Common impurities: Pd,Ni,Sn,Te
At the Sudbury Complex, Sudbury District, Ontario, Canada, insizwaite occurs in copper-nickel sulphide ore (HOM).
At the type locality, Waterfall gorge, Insizwa, Alfred Nzo District, Eastern Cape, South Africa, insizwaite is of hydrothermal origin, in a vein cutting massif pyrrhotite ore, where it occurs as small rounded grains. Associated minerals include pentlandite, cubanite, hessite, altaite, argentopentlandite, chalcopyrite, mackinawite, niggliite, froodite, parkerite, galena, sphalerite, magnetite and pyrrhotite (MM 38.794-800, HOM).
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