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Formula: Ca(VO3)2.4H2O
Vanadate, rossite group,
paramorph of
calciodelrioite
Crystal System: Triclinic
Specific gravity: 2.45 measured, 2.42 calculated
Hardness: 2 to 3
Colour: Pale yellow, yellow in transmitted light
Solubility: Slowly soluble in water
Environments
Rossite is a rare vanadium-bearing mineral that occurs in veinlets in
carnotite-bearing sandstone (Webmin). It
dehydrates reversibly to metarossite within a matter of weeks. Associated minerals include
epsomite, gypsum,
huemulite, hummerite and
thénardite
(Mindat).
Localities
At the Huemul Mine, Pampa Amarilla mining district, Malargüe Department, Mendoza Province, Argentina, rossite is associated with
huemulite, hummerite,
thénardite, gypsum and
epsomite
(HOM).
At the type locality, the Arrowhead tunnel, Bull Pen Canyon, San Miguel county, Colorado, USA, rossite occurs as small glassy
kernels embedded in flaky metarossite in carnotite-bearing
sandstone, associated with metarossite,
carnotite and gypsum
(HOM, Mindat, AM 13.160).
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