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Melanterite is the mineral form of hydrous iron(II) sulfate FeSO4 ยท 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.[1] It was first described in 1850.


1. ^ a b http://www.mindat.org/min-2633.html Mindat
2. ^ http://webmineral.com/data/Melanterite.shtml Webmineral data
3. ^ http://rruff.geo.arizona.edu/doclib/hom/melanterite.pdf Handbook of Mineralogy

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