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Formula: Rh3Ni32S32
Sulphide, pentlandite group,
rhodium-bearing mineral
Crystal System: Isometric
Specific gravity: 5.195 calculated
Colour: Creamy brown, white, grey
Environments
Oberthürite is a relatively new platinum group mineral
approved in 2017.
Localities
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, 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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