Vésigniéite

vanadate

volborthite

Formula: Cu3Ba(VO4)2(OH)2
Anhydous vanadate containing hydroxyl, copper and barium.
Specific gravity: 4.56
Hardness: 3 to 4
Streak: Greenish
Colour: Yellow-green, dark olive-green
Environments

Hydrothermal environments

Vésigniéite is a rare supergene copper-vanadium mineral.

At the type locality, the Glücksstern Mine, Gottlob Hill, Friedrichroda, Gotha, Thuringia, Germany, vésigniéite is found as geodes in manganese ore (AM 40.942), associated with volborthite, malachite, tyuyamunite, carnotite, baryte and calcite (HOM).

At New Cliffe quarry, Stanton under Bardon, Leicestershire, England, UK, vésigniéite has been found as a crust of crystals on diorite wall rock (RES p198).

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