Melanterite
Lua error in Module:Infobox at line 235: malformed pattern (missing ']'). 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[1] and as a rare sublimate phase around volcanic fumaroles.[3] Associated minerals include pisanite, chalcanthite, epsomite, pickeringite, halotrichite and other sulfate minerals.[3]
It was first described in 1850.[3]
Gallery
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Melanterite crystal structure.png
Crystal structure of melanterite
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Cuprian Melanterite - Parys Mountain Mines, Amlwch, Isle of Anglesey, Wales, UK.jpg
Cuprian Melanterite
References
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