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Formula: PdBiSe
Selenide, cobaltite group,
palladium- and bismuth-
bearing mineral
Crystal System: Isometric
Specific gravity: 9.86 calculated
Hardness: 3 to 4
Colour: Light yellow
Common impurities: Pt,Ag,S
Environments
Metamorphic environments
Hydrothermal environments
Localities
At the Buraco do Ouro mine, Cavalcante, Goiás, Brazil, padmaite occurs in hydrothermally altered
granite-related
mylonite. Associated minerals include
clausthalite, kalungaite,
sperrylite, uraninite and
paraguanajuatite
(HOM).
At the type locality, the Srednyaya Padma mine, Zaonezhie peninsula, Medvezhyegorsky District, Republic of Karelia,
Russia, padmaite occurs as isometric, irregular grains up to 0.2 mm across, and as symplectic (produced
by the intimate intergrowth of two different minerals) intergrowths with
palladium sulphides up to 0.02 mm in size. Padmaite occurs in
metasomatic rocks formed in shungite (possibly metamorphosed oil shale)-bearing
metashales of Lower Proterozoic age (2.5 to 1.6 billion years ago).
Associated minerals include clausthalite,
paraguanajuatite,
bohdanowiczite,
sobolevskite, froodite,
hematite, native bismuth,
native gold, roscoelite,
chromium-bearing phengite,
dolomite and quartz
(AM 78.450-455).
Padmaite from the Srednyaya Padma mine -
Image
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