Descloizite

vanadate

mottramite

Formula: PbZn(VO4)(OH) anhydrous vanadate containing hydroxyl
Specific gravity: 6.2
Hardness: 3 to 3½
Streak: Orange to brownish-red
Colour: Brownish red, red-orange, reddish brown to blackish brown, nearly black
Solubility: Readily soluble in acids
Environments

Hydrothermal environments

Descloizite is a secondary mineral often found in the oxidation zones of metal ore deposits in association with mottramite in ore bodies containing vanadinite, pyromorphite, mimetite and cerussite. It has been found as pseudomorphs after vanadinite (Dana).

At Berg Aukas Mine and at Tsumeb, Namibia, descloizite occurs with mottramite in sandy pockets in limestone and dolomite.

At the Whitwell quarry, Derbyshire, England, UK, descloizite occurs on dolomite, associated with vanadinite (RES p137, 138)

At the Mammoth Mine, Arizona, USA, descloizite occurs with mottramite (Dana).

At the Kabwe mine, Central Province, Zambia, descloizite is an abundant mineral associated with tarbuttite or with smithsonite. It also occurs as thin lamellae in vanadinite (R&M 94.2.125).

Common impurities: Cu

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