Mohrite
{{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 = NH4)2Fe(SO4)2·6 H2O
| 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, (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, Moscow[http://www.mindat.org/min-2742.html Mindat - Mohrite]{{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 }}
The mineral crystallizes in the monoclinic crystal system with space group P21/a.{{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 (ND4)2Fe(SO4)2 · 6 D2O 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 }}