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Formula: KMgV5+5O14.8H2O
Decavanadate,
pascoite group
Hardness: 2
Streak: Yellow
Colour: Yellow, light orange
Solubility: Soluble in water
Environments
Sedimentary environments
Hydrothermal environments
Hummerite is leached from vanadium oxide ores and deposited in veins in
clay and as efflorescences on
uranium-vanadium deposits in
sandstone
(HOM).
Localities
At the Huemul Mine, Pampa Amarilla mining district, Malargüe Department, Mendoza Province, Argentina, hummerite
is associated with huemulite, rossite,
thénardite, gypsum and
epsomite
(HOM).
At the Blue Streak Mine, Bull Canyon Mining District, Montrose county, Colorado, USA, hummerite is associated
with gypsum, huemulite,
metamunirite, munirite and
bluestreakite
(HOM).
The type locality is the Hummer Mine, Paradox Valley, Uravan Mining District, Montrose county, Colorado, USA.
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