Scorodite

arsenate

hydrothermal

Formula: Fe3+(AsO4).2H2O
Forms a series with mansfieldite.
Specific gravity: 3.27
Hardness: 3½ to 4
Streak: Greenish-White
Colour: Green, grey, blue, yellow-brown, nearly colourless, violet; colourless to greenish or in transmitted light.
Solubility: Soluble in acids. Decomposes in strong alkali with separation of hydrous iron oxide.
Environments

Hydrothermal environments

Scorodite is found as a primary mineral at hydrothermal deposits, for example Saubach, Germany, but mostly as a secondary mineral from the oxidation of arsenopyrite or other arsenic-containing minerals. It is associated with pharmacosiderite, beudantite, vivianite, gypsum and chalcedony. Alters to limonite.
Common impurities: Al

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