Alum.

Abstract/Description: KAl(SO4)2-12H2O - Mohs Hardness: 2. Alum is the common name for this chemical compound, given the nomenclature of potassium aluminum sulfate dodecahydrate. It is commonly used in water purification, leather tanning, dyeing, fireproof textiles, and baking powder.
Subject(s): Esmeralda County, NV, United States
environmental sciences