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Formula: Cu3Ba(VO4)2(OH)2
Anhydous vanadate containing hydroxyl, copper and barium.
Crystal System: Monoclinic
Specific gravity: 4.56 measured, 4.7 calculated
Hardness: 3 to 4
Streak: Greenish
Colour: Yellow-green, dark olive-green
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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