Bokite

bokite

navajoite

kazakhstanite

jarosite

Images

Formula: (Al,Fe)_1.3(V⁵⁺,V⁴⁺,Fe³⁺)₈O₂₀.7.5H₂O
Hydrated vanadate, straczekite group
Crystal System: Monoclinic
Specific gravity: 2.97 to 3.1 measured, 3.41 calculated
Hardness: 3
Streak: Black, may be brownish black
Colour: Black
Melts at 950^oC
Solubility: Slightly soluble in cold acids with the formation of a pale green solution, dissolves completely in 40% KOH or NaOH
Environments

Sedimentary environments
Hydrothermal environments

Bokite occurs as a constituent of uranium-vanadium ores in triassic stream channels, and impregnating sandstone (Mindat).

Localities

There are two co-type Localities, the Balasauskandyk V Deposit, Shieli, Kyzylorda Region, Kazakhstan and the Kurumsak V Deposit, Aksumbe, Turkistan Region, Kazakhstan. Bokite occurs as platy to columnar or wedge-shaped grains, to 0.3 mm long, in carbonaceous vanadiferous shale. Associated minerals include kazakhstanite and jarosite (Mindat).

At the Monument No. 2 mine, Monument No. 2 channel, Yazzie Mesa, Cane Valley Mining District, Apache County, Arizona, USA, bokite occurs in rich uranium–vanadium ore in Triassic stream channels and impregnating sandstone. Associated minerals include navajoite (HOM).

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