- Chemical Formula: NH4Fe(SO4)2
- Form: Pale violet octahedral crystals
- Grade: ACS
- CAS #: 10138-04-2
- IUPAC Name: Ammonium iron(III) sulfate
Ammonium iron(III) sulfate, NH4Fe(SO4)2·12 H2O, also known as ferric ammonium sulfate (FAS) or iron alum, is a double salt in the class of alums, which consists of compounds with the general formula AB(SO4)2 · 12 H2O
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