Zippeite

zippeite

uranopilite

uranophane

schrockingerite

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Formula: K3(UO2)4(SO4)2O3(OH).3H2O
Hydrated sulphate containing hydroxyl, zippeite group
Specific gravity: 4.794 calculated
Hardness: 2
Streak: White, yellow
Colour: Golden yellow, light yellow, orange-yellow
Solubility: Fairly soluble in acid waters (Dana)
RADIOACTIVE
Environments

Hydrothermal environments

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 include uranopilite, natrozippeite, nickelzippeite, magnesiozippeite, johannite, uranophane, schröckingerite and gypsum. The sulphate content comes from the oxidation of sulphides, chiefly pyrite and chalcopyrite (CM 14.429-436, HOM).

Localities

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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