Scorodite

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scorodite

[′skȯr·ə‚dīt]
(mineralogy)
FeAsO4·2H2O A pale leek-green or liver-brown orthorhombic mineral consisting of ferric arsenate; isomorphous with mansfieldite and represents a minor ore of arsenic.

Scorodite

 

a mineral with the chemical composition Fe[AsO4].2H2O. Scorodite contains 34.60 percent Fe2O3, 49.79 percent As2O5, and 15.61 percent H2O; if it contains more than 16 percent P2O5, it is called phosphoscorodite. Scorodite crystallizes in the orthorhombic system, forming dipyramidal, tabular, or prismatic crystals. Solid earthy aggregates, incrustations, spherulites, and microcrystalline druses are common. Scorodite is pale green, grayish green, or grayish brown in color. It has a hardness of 3.5—4 on the Mohs’ scale, and its density ranges from 3,100 to 3,300 kg/m3.

Scorodite is a mineral from the oxidation zone of deposits containing arsenical pyrites (for example, arsenopyrite) or loellingite. Together with these minerals, it serves as raw material for the extraction of arsenic. In the USSR, scorodite deposits are found in Kazakhstan, Uzbekistan, Transbaikalia, and the Urals; it is also found in the German Democratic Republic (Saxony), the USA, and Brazil.