Carnotite

carnotite

tyuyamunite

volborthite

hewettite

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Formula: K2(UO2)2(VO4)2.3H2O
Hydrated normal vanadate, carnotite group
Specific gravity: 4.70
Hardness: 2
Streak: Strontian-yellow
Colour: Bright yellow, yellow, greenish yellow
Solubility: Readily soluble in acids
RADIOACTIVE
Environments

Sedimentary environments

Carnotite is a secondary vanadate resulting from the alteration of uraninite, montroseite or davidite. It occurs in paleochannels in sandstone in Colorado Plateau-type uranium-vanadium deposits, found near fossil carbonaceous matter, and in calcretes and near playas (Mindat, HOM).
Associated minerals include tyuyamunite, metatyuyamunite, volborthite, tangeite, metatorbernite, pintadoite, rauvite, rossite, uvanite, vanoxite, hewettite, gypsum and baryte (Mindat, HOM).

Localities

At the type locality, the Rajah Mine, Uravan Mining District, Montrose county, Colorado, USA, carnotite occurs in a Colorado Plateau type sedimentary vanadium-uranium deposit (Mindat).

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