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Formula: Ca3V5+10O28.17H2O
Decavanadate,
pascoite group
Crystal System: Monoclinic
Specific gravity: 2.455 measured, 2.465 calculated
Hardness: 2½
Streak: Cadmium-yellow
Colour: Dark red-orange to yellow-orange, dirty yellow upon partial dehydration
Solubility: Soluble in water
Environments
Sedimentary environments
Hydrothermal environments
Pascoite is widely distributed in sedimentary uranium-vanadium deposits
(Dana), as a secondary mineral occurring as a leachate of
near-surface vanadium oxides by ground waters and as efflorescences in mine tunnels.
Carnotite is a commonly associated mineral
(HOM, Mindat).
Localities
At the type locality, the Ragra Mine, Huayllay District, Pasco Province, Pasco, Peru, pascoite occurs as
efflorescences in mine tunnels
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