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Formula: CuPb2(CrO4)(PO4)(OH)
Compound phosphate, chromium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 6.16 measured and calculated
Hardness: 2½ to 3
Streak: Greenish or brownish
Colour: Olive-green, apple-green, brown to nearly black
Solubility: Partially soluble in nitric acid
(Mindat)
Environments:
Vauquelinite is a rare mineral in the oxidised zones of some hydrothermal base-metal deposits.
Localities
At the type locality, the Tsvetnoi Mine, Middle Urals, Russia, vauquelinite is associated with
crocoite, pyromorphite,
mimetite, cerussite,
beudantite and duftite
(HOM).
Vauquelinite from the Tsvetnoi Mine -
Image
At Otto Mountain, Baker, Soda Mountains, Silver Lake Mining District, San Bernardino county, California, USA,
timroseite occurs on fracture surfaces and in small vugs in
brecciated quartz veins; it
is directly associated with acanthite,
cerussite, bromine-rich
chlorargyrite,
chrysocolla, gold,
housleyite, iodargyrite,
khinite-40, markcooperite,
ottoite, paratimroseite,
thorneite, vauquelinite and
wulfenite
(AM 95.1560-1568).
Vauquelinite from Otto Mountain - Image
Alteration
Vauquelinite has been reported as an alteration product of
pyromorphite and as incrustation
pseudomorphs after
dolomite
(Mindat).
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