Zeunerite

minerals

olivenite

mansfieldite

scorodite

Formula: Cu(UO2)2(AsO4)2.12H2O
Hydrated normal arsenate, autunite group
Specific gravity: 3.47
Hardness: 2½
Streak: Pale green
Colour: Pale to emerald green
RADIOACTIVE
Environments

Hydrothermal environments

Zeunerite is an uncommon secondary mineral in the oxidised zone of arsenic-bearing hydrothermal uranium deposits (HOM, Mindat, Webmin). Associated minerals include olivenite, mansfieldite, scorodite, azurite and malachite (HOM, Mindat).

Localities

The type locality is the Walpurgis Flacher vein, Weißer Hirsch Mine (Shaft 3), Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany.

Alteration

At 65oC in air zeunerite transforms to metazeunerite with 8H2O (Dana, Webmin, Mindat).

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