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Formula: Co(UO2)2(SO4)O2.3.5H2O
Hydrated sulphate, zippeite group,
uranyl mineral
Crystal System: Monoclinic
Specific gravity: 4.948 calculated
Hardness: 2
Colour: Tan to brownish yellow, yellow-orange
Very strongly RADIOACTIVE
Environments
Sedimentary environments
hydrothermal environments
Localities
At the type locality, the Happy Jack Mine, White Canyon Mining District, San Juan County, Utah, USA,
cobaltzippeite occurs rarely as efflorescences on the mine walls in oxidised portions of the
uraninite deposit containing
gersdorffite. Associated minerals include
natrozippeite, uranopilite,
johannite, zeunerite,
chalcanthite, antlerite,
siderotil, bieberite,
erythrite, epsomite and
gypsum
(HOM).
Cobaltzippeite from the Happy Jack Mine -
Image
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