Alum

[Synthetic Mineral]

Photographed by Michael P. Klimetz

[Laboratory Grown Crystals]

[KAl(SO4)2·12H2O]

[A trade name for hydrated potassium aluminum sulfate]

POLAND

Photographed by Michael P. Klimetz

[Laboratory Grown Crystals]

[KAl(SO4)2·12H2O]

[A trade name for hydrated potassium aluminum sulfate]

POLAND