Tags: Chemical Substance, Mineral.

Alum-(K) is a hydrous potassium aluminium sulfate mineral with formula KAl(SO4)2·12(H2O). It is the mineral form of potassium alum and is referred to as potassium alum in older sources. It is a member of the alum group.It occurs as colorless to white soft isometric crystals and efflorescence coatings.

Potassium_alum_octahedral_like_crystal.jpg

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