Potassium Alum - National Gem Lab

Alum-(K) (also known as Potassium Alum) is a sulfate mineral that is very rarely available as a faceted gem. The chemical formula of Alum-(K) is KAl(SO4)2·12(H2O) (Hydrated Potassium Aluminum Sulfate) and its molecular weight is 474.39 gm. It is a very unusual mineral in that it is both barely radioactive and water soluble. Alum-(K) has a specific

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