Hydrated uranyl sulphate containing hydroxyl, zippeite group, nickel-bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.3
Hardness: 5 to 5½
Colour: Tan to brownish yellow, yellow-orange
Luminescence: Fluoresces bright yellow under short wave and long wave UV
Nickelzippeite occurs typically as secondary coatings on
mine walls, derived from oxidation of uranium-bearing primary
nickel-cobalt sulphides. Associated
minerals include cobaltzippeite,
epsomite, gypsum and
At the type locality, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, nickelzippeite occurs as very fine grained material, in crusts and coatings (Mindat).
At the Happy Jack mine, White Canyon Mining District, San Juan County, Utah, USA, nickelzippeite is associated with natrozippeite, uranopilite, johannite and zeunerite (Dana).
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