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Formula: Pd3Tl
Platinum group mineral, alloy of
thallium
and palladium
Crystal System: Tetragonal
Specific gravity: 13.04 calculated
Environments
Localities
The type locality is Borehole 1818, Monchetundra deposit, Monche tundra intrusion, Murmansk Oblast, Russia.
Palladothallite is a new mineral (approved in 2020) found here. It occurs in
orthopyroxenite with disseminated
nickel-copper-iron
sulphides and in near-surface oxidised ore of an orthopyroxenite
unit. In the holotype specimen, the new mineral forms anhedral grains about 1 to 20 μm in size intergrown with
bortnikovite. Palladothallite and
bortnikovite form a rim around
tulameenite,
platinum-palladium-iron-copper
alloys, and
platinum-palladium-iron-copper
“oxides” in a goethite matrix
CM 59.1821-1832
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