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Melanterite is the mineral form of hydrous iron(II) sulfate FeSO4 · 7 H2O. It is a secondary sulfate mineral which forms from the oxidation of primary sulfide minerals in the near-surface environment. It often occurs as a post mine encrustation on old underground mine surfaces. It also occurs in coal and lignite seams exposed to humid air. It was first described in 1850.
1. ^ a b http://www.mindat.org/min-2633.html Mindat