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Melanterite
Melanterite is a mineral form of hydrous iron(II) sulfate: FeSO4·7H2O. It is the iron analogue of the copper sulfate chalcanthite. It alters to siderotil by loss of water. It is a secondary sulfate mineral which forms from the oxidation of primary sulfide minerals such as pyrite and marcasite 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〔 and as a rare sublimate phase around volcanic fumaroles.〔 Associated minerals include pisanite, chalcanthite, epsomite, pickeringite, halotrichite and other sulfate minerals.〔 It was first described in 1850.〔 ==Gallery==
File:Melanterite crystal structure.png|Crystal structure of melanterite File:Cuprian Melanterite - Parys Mountain Mines, Amlwch, Isle of Anglesey, Wales, UK.jpg|Cuprian Melanterite
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