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Formula: (V5+,Fe3+)10O24.12H2O
Simple oxide
Specific gravity: 2.56
Hardness: 1½
Streak: Light brown
Colour: Dark brown
Environments
Sedimentary environments
Hydrothermal environments
Localities
At the type locality, the Monument No. 2 mine, Monument No. 2 channel, Yazzie Mesa, Cane Valley Mining District, Apache County, Arizona,
USA, navajoite occurs in the highly oxidised portion of a Colorado Plateau-type
uranium-vanadium deposit, in a stream channel filled with
conglomeratic and silty
sandstone, impregnating the sandstone
and forming seams in it and coatings on pebbles, and filling small fractures in clay lenses.
It is thought to be an oxidation product of corvusite. Associated minerals include
corvusite, tyuyamunite,
rauvite, hewettite,
steigerite and limonite. Only one of these,
corvusite, has both V4+ and V5+, and the rest are fully oxidised
(AM 40.207-212, HOM).
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