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Scorodite, mineral in the variscite group, hydrated iron arsenate (FeAsO4·2H2O). It forms pale leek-green or grayish green to liver-brown aggregates of crystals, or pale green to pale grayish or brownish green earthy masses. Scorodite forms a continuous solid-solution series with mansfieldite in which aluminum replaces iron in the scorodite structure. Mansfieldite forms white to pale gray crusts and porous masses. These minerals occur in weathered zones formed by the oxidation of arsenopyrite. For detailed physical properties, see arsenate mineral (table).
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Arsenate mineral, any of a group of naturally occurring compounds of arsenic, oxygen, and various metals, most of which are rare, having crystallized under very restricted conditions. At the mineralogically famous Långban iron and manganese mines in central Sweden, more than 50 species of arsenate minerals have been described, many…
Mansfieldite, arsenate mineral (AlAsO4·2H2O) similar to scorodite ( q.v.).…