Mohrite, (NH4)2Fe(SO4)2·6 H2O, is a rare ammonium iron(II) sulfate mineral originally found in the geothermal fields of Tuscany, Italy.Fleischer M. 1965: New mineral names. American Mineralogist, 50, 805 This Fe-dominant analogue of boussingaultite is sometimes reported from burning coal dumps where it is a product of pyrite oxidation.Chesnokov B. V. and Shcherbakova E. P. 1991: Mineralogiya gorelykh otvalov Chelyabinskogo ugolnogo basseina - opyt mineralogii tekhnogenesa. Nauka, MoscowMindat - Mohrite
The mineral crystallizes in the monoclinic crystal system with space group P21/a.
See also Acid mine drainage, pyrite oxidation Mohr's salt
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