Germanide, palladium-bearing mineral
Specific gravity: 10.74 calculated
Colour: White, greyish white
Plutonic igneous environments
Marathonite and palladogermanide were the first two
germanide minerals to be discovered and approved, in 2016, in association
at the common type locality.
At the type locality, the Marathon deposit, Coldwell complex, Thunder Bay District, Ontario, Canada, palladogermanide occurs as an angular, anhedral grain measuring 29 × 35 μm. Associated minerals include marathonite, vysotskite, a gold-silver alloy, isoferroplatinum, germanium-bearing keithconnite, majakite, coldwellite, cuprorhodsite-ferhodsite, kotulskite and mertieite-II, the base-metal sulphides, chalcopyrite, bornite, millerite and a rhodium-bearing pentlandite, oberthürite and torryweiserite, and silicates including a clinoamphibole and an iron-rich chlorite-group mineral.
The observed paragenetic sequence is:
bornite → marathonite → palladogermanide.
Palladogermanide is stable down to 200°C. It occurs in an assemblage of clinoamphibole, an iron-rich chlorite-group mineral, and fragmented chalcopyrite. Palladogermanide is also found associated with magnetite of near end-member composition. It is considered to have developed at temperatures of 500 to 600°C (CM 59.1865-1886).
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