Melanovanadite

melanovanadite

duttonite

pascoite

sherwoodite

Images

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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