Sulphide, rhodium-bearing mineral
Specific gravity: 5.195 calculated
Colour: Creamy brown, white, grey
Plutonic igneous environments
Oberthürite is a new platinum-group mineral approved in 2017.
At the type locality, the Marathon deposit, Coldwell complex, Thunder Bay District, Ontario, Canada, oberthürite was discovered in a heavy-mineral concentrate. The deposit consists of disseminated sulphides hosted by gabbro. Associated minerals include vysotskite, a gold-silver alloy, isoferroplatinum, germanium-bearing keithconnite, majakite, coldwellite, cuprorhodsite–ferhodsite, kotulskite, mertieite-II, and the base-metal sulphides, chalcopyrite, bornite, millerite, and rhodium-bearing pentlandite. Grains of oberthürite are up to 100 × 100 μm in size and the mineral commonly develops in larger composites with coldwellite, isoferroplatinum, zvyagintsevite, rhodium-bearing pentlandite and torryweiserite (CM 59.1833-1863).
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