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Formula: K2(UO2)2(VO4)2.3H2O
Hydrated normal vanadate, uranyl
mineral, carnotite group
Crystal System: Monoclinic
Specific gravity: 4.70 measured, 4.91 calculated
Hardness: 2
Streak: Strontian-yellow
Colour: Bright yellow, yellow, greenish yellow
Solubility: Readily soluble in acids
RADIOACTIVE
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).
Carnotite from the Uravan Mining District -
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