Mohrite

Mohrite, (NH₄)₂Fe(SO₄)₂·6 H₂O, is a rare ammonium iron(II) sulfate mineral originally found in the geothermal fields of Tuscany, Italy.^[1] This Fe-dominant analogue of boussingaultite is sometimes reported from burning coal dumps where it is a product of pyrite oxidation.^[2][3][4]

Mohrite
A close up of the yellowish microcrystals of the mohrite mineral
General
Category	Minerals
Formula	NH4)2Fe(SO4)2·6 H2O

The mineral crystallizes in the monoclinic crystal system with space group P2₁/a.^[5]

See also

• Acid mine drainage, pyrite oxidation
• Mohr's salt