Tags: Chemical Compound, Chemical Substance.

Ammonium aluminium sulfate also known as ammonium alum or just alum is a white crystalline double sulfate usually encountered as the dodecahydrate formula (NH4)Al(SO4)2·12H2O. It is used in small amounts in a variety of niche applications. The dodecahydrate occurs naturally as the rare mineral tschermigite.

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