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Formula: CaU5+(UO2)2(CO3)O4(OH).7H2O
Hydrated carbonate, uranyl mineral, one of very few minerals containing
pentavalent uranium, U5+, others are richetite,
shinkolobweite and
nollmotzite.
Crystal System: Orthorhombic
Specific gravity: 4.69 measured
Hardness: 3 to 4
Streak: Brownish violet
Colour: Black, violet-black (fresh); yellowish brown, greenish brown (exposed)
Very strongly RADIOACTIVE
Environments
Sedimentary environments
Hydrothermal environments
Localities
At the type locality, the Shinkolobwe Mine, Shinkolobwe, Kambove Territory, Haut-Katanga, DR Congo, wyartite
occurs as a rare secondary mineral formed as an alteration
product of uraninite in the oxide zone of the
uranium deposit. Associated minerals include
wölsendorfite,
rutherfordine, uranophane,
masuyite, urancalcarite and
uraninite
(HOM).
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