Corvusite

minerals

fervanite

roscoelite

carnotite

Formula: (Na,Ca,K)1-x(V5+,V4+,Fe2+)8O20.4H2O
Oxide, straczekite group, vanadium-bearing mineral
Specific gravity: 2.82
Hardness: 2½ to 3
Streak: Blue-black to brown
Colour: Blue-black, brown
Solubility: Soluble in mineral acids
Environments

Sedimentary 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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