{{Short description|Rare ammonium iron(II) sulfate mineral}} {{Infobox mineral | name = Mohrite | boxwidth = | boxbgcolor = | image = Mohrite.jpg | imagesize = | alt = | caption = A close up of the yellowish microcrystals of the mohrite mineral | struct image = | struct caption = | struct imagesize = | struct2 image = | struct2 caption = | struct2 imagesize= | SMILES = | Jmol = | category = | formula = (NH<sub>4</sub>)<sub>2</sub>Fe(SO<sub>4</sub>)<sub>2</sub>·6 H<sub>2</sub>O | IMAsymbol = | molweight = | strunz = | dana = | system = | class = | symmetry = | unit cell = | color = | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | toughness = | mohs = | luster = | streak = | diaphaneity = | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }} '''Mohrite''', (NH<sub>4</sub>)<sub>2</sub>Fe(SO<sub>4</sub>)<sub>2</sub>·6 H<sub>2</sub>O, is a rare ammonium iron(II) sulfate mineral originally found in the geothermal fields of Tuscany, Italy.<ref>Fleischer M. 1965: New mineral names. American Mineralogist, 50, 805</ref> This Fe-dominant analogue of boussingaultite is sometimes reported from burning coal dumps where it is a product of pyrite oxidation.<ref>Chesnokov B. V. and Shcherbakova E. P. 1991: Mineralogiya gorelykh otvalov Chelyabinskogo ugolnogo basseina - opyt mineralogii tekhnogenesa. Nauka, Moscow</ref><ref>[http://www.mindat.org/min-2742.html Mindat - Mohrite]</ref><ref>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/mohrite.pdf |title=Handbook of Mineralogy - Mohrite |access-date=2013-01-25 |archive-date=2012-07-16 |archive-url=https://web.archive.org/web/20120716025543/http://www.handbookofmineralogy.com/pdfs/mohrite.pdf |url-status=dead }}</ref>
The mineral crystallizes in the monoclinic crystal system with space group ''P2<sub>1</sub>/a''.<ref name="Figgis_1989">{{cite journal |last1=Figgis |first1=B. N. |last2=Kucharski |first2=E. S. |last3=Reynolds |first3=P. A. |last4=Tasset |first4=F. |title=The structure of (ND<sub>4</sub>)<sub>2</sub>Fe(SO<sub>4</sub>)<sub>2</sub> · 6 D<sub>2</sub>O at 4.3 K by neutron diffraction |journal=Acta Crystallographica Section C Crystal Structure Communications |date=15 June 1989 |volume=45 |issue=6 |pages=942–944 |doi=10.1107/S0108270188013903|bibcode=1989AcCrC..45..942F }}</ref>
==See also== * Acid mine drainage, pyrite oxidation * Mohr's salt
==References== {{reflist}}
Category:Ammonium minerals Category:Iron(II) minerals Category:Sulfate minerals Category:Monoclinic minerals Category:Minerals in space group 14
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