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Formula: CoAl2(SO4)4.22H2O
Hydrated sulphate, halotrichite group,
cobalt-bearing mineral
Crystal System: Monoclinic
Specific gravity: 1.92 measured, 1.87 calculated
Hardness: 1½ to 2
Streak: White
Colour: Light pink, pink-red
Solubility: Soluble in water
Environments
Localities
At the type locality, Cameron, Cameron Mining District, Coconino County, Arizona, USA, wupatkiite occurs as
cross-fibre veinlets that formed as a post-mining oxidation product on the walls of a shallow open cut near Gray
Mountain. Fibres are 5-10 microns in diameter, but up to 8 mm long. Wupatkiite is a rare post-mine oxidation
product of sooty black
uranium - cobalt -
nickel -molybdenum material.
The wupatkiite is associated with pickeringite,
moorhouseite,
nickelboussingaultite,
quartz and clay
(AM 81.518, HOM).
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