Alvanite

alvanite

vanadate

mica

roscoelite

Images

Formula: Zn2+Al4(V5+O3)2(OH)12.2H2O
Hydrated vanadate, zinc-bearing mineral
Crystal system: Monoclinic
Specific gravity: 2.49 measured, 2.492 calculated
Hardness: 3 to 3½
Streak: White
Colour: Pale bluish green to bluish black
Solubility: Soluble in hydrochloric acid and in nitric acid only when heated
Environments

Sedimentaary environments
Hydrothermal environments

Localities

There are two co-type localities, the Balasauskandyk V Deposit, Shieli District, Kyzylorda Region, Kazakhstan, and the Kurumsak V Deposit, Aksumbe, Sozak District, Turkistan Region, Kazakhstan.

At the type localities, aluminum vanadates were found in several mines, in the oxidation zone of the vanadiferous clay-anthraxolite (pyrobitumen) horizon.
The alvanite occurs in mica-like platelets of hexagonal form (AM 44.1325-1326). Associated minerals include mica and possibly roscoelite (HOM).
Alvanite from the Kurumsak V Deposit - Image

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