Compound phosphate, chromium-bearing mineral
Specific gravity: 6.16
Hardness: 2½ to 3
Streak: Greenish or brownish
Colour: Olive-green, apple-green, brown to nearly black
Solubility: Partially soluble in nitric acid (Mindat)
Vauquelinite is a rare mineral in the oxidised zones of some hydrothermal base-metal deposits.
At the type locality, the Tsvetnoi Mine, Middle Urals, Russia, vauquelinite is associated with crocoite, pyromorphite, mimetite, cerussite, beudantite and duftite (HOM).
Vauquelinite has been reported as an alteration product of pyromorphite and as incrustation pseudomorphs after dolomite (Mindat).
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