Alloy of platinum and tin
Specific gravity: 15.08 calculated
Colour: White with a yellow tint
At the type locality, Rustenburg Town & Townlands Farm, Rustenburg, Rustenburg Local Municipality, Bojanala Platinum District Municipality, North West, South Africa, rustenburgite occurs as very sparse grains in concentrates. Associated minerals include atokite and unspecified platinum tellurides (HOM).
At the Stillwater Complex, Montana, USA, rustenburgite is associated with moncheite, pyrrhotite and pentlandite (HOM).
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