Mixite

arsenate

hydrothermal

Formula: Cu6Bi(AsO4)3(OH)6.3H2O
Hydrated arsenate with hydroxyl, mixite group
Specific gravity: 3.79
Hardness: 3 to 4
Streak: Lighter than colour
Colour: Emerald green to blue-green to whitish
Environments:

Hydrothermal environments

Mixite is an uncommon secondary mineral in the oxidised zone of bismuth-bearing copper deposits, associated with bismutite, skutterudite, bismuth, atelestite, erythrite, malachite and baryte.

At the type locality, Jáchymov, Bohemia, Czech Republic, mixite occurs with bismutite, skutterudite and native bismuth.

At the St Anton mine and Humbachtal, Wittichen District, Germany, mixite occurs with erythrite and baryte.

At the San Rafael mine, Nye county, Nevada, USA, mixite is associated with plumbojarosite, olivenite and kaolinite.

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