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Formula: Pd2Ge
Germanide, palladium-bearing
mineral
Crystal System: Hexagonal
Specific gravity: 10.74 calculated
Colour: White, greyish white
Environments
Marathonite and palladogermanide were the first two
germanide minerals to be discovered and approved, in 2016, in association
at the common type locality.
Localities
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,
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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