Hydrated sulphate containing hydroxyl, zippeite group
Specific gravity: 4.794 calculated
Streak: White, yellow
Colour: Golden yellow, light yellow, orange-yellow
Solubility: Fairly soluble in acid waters (Dana)
Zippeite is secondary in origin and typically occurs in the
oxidised zone of uraninite deposits in igneous or metamorphic rocks containing
sulphides. It is also found, sometimes abundantly, as efflorescences on the walls of mine workings. Associated minerals
uranophane, schröckingerite and
gypsum. The sulphate content comes from the oxidation of sulphides, chiefly
pyrite and chalcopyrite
(CM 14.429-436, HOM).
At the type locality, the Elias Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, zippeite is associated with uranopilite, uraninite, limonite and gypsum (Mindat).
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