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Formula: Ca(V5+,V4+)4O10.5H2O
Hydrated vanadate
Crystal system: Triclinic
Specific gravity: 2.55 measured, 2.53 calculated
Hardness: 2½
Streak: Dark reddish brown
Colour: Black; dark reddish brown in transmitted light
Solubility: Readily soluble in acids, decomposed by KOH
Environments
Sedimentary environments
Hydrothermal environments
Melanovanadate is a secondary mineral occurring in
Colorado Plateau-type U-V deposits
(Mindat ).
Localities
At the type locality, the Ragra Mine, Huayllay District, Pasco Province, Pasco, Peru, melanovanadite occurs
in altered black shale in a very rich
vanadium deposit. Associated minerals include
pascoite, pyrite,
copper, gypsum,
patrónite and sherwoodite
(HOM).
Melanovanadite from the Ragra Mine -
Image
At the Peanut Mine, Bull Canyon, Montrose County, Colorado, USA, melanovanadite is associated with
duttonite
(HOM).
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