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Formula: (Na,Ca,K)1-x(V5+,V4+,Fe2+)8O20.4H2O
Oxide, straczekite group,
vanadate
Crystal System: Monoclinic
Specific gravity: 3.09 to 3.29 measured, 3.21 calculated
Hardness: 2½ to 3
Streak: Blue-black to brown
Colour: Blue-black, brown
Solubility: Soluble in mineral acids
Environments
Corvusite is widely distributed in uranium -
vanadium deposits in
sandstone. Associated minerals include
carnotite,
fervanite, roscoelite and
gypsum
(HOM).
Localities
There are two co-type Localities, the Ponto No. 3 Claim, Gypsum Valley Mining District, San Miguel county, Colorado, USA, and the Jack claim,
La Sal Mining District, North Mountain, La Sal Mountains, Grand county, Utah, USA.
At the Ponto No. 3 Claim, Gypsum Valley Mining District, San Miguel county, Colorado, USA, a dull brown,
fine-grained mineral occurs that appears
to be a mixture of corvusite and a roscoelite-type
vanadium
mica
(AM 75.508-521).
At the Jack claim, La Sal Mining District, North Mountain, La Sal Mountains, Grand county, Utah, USA, the
corvusite is purplish blue-black
in colour. There are numerous shrinkage cracks inthe samples, some filled with
gypsum and
fervanite (AM 18.195-205). The cracks are apparently due to loss
of water
(AM 75.508-521).
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