ammonium alum

Definitions of ammonium alum
1

n a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum

Synonyms:
alum, ammonia alum
Type of:
Al, aluminium, aluminum, atomic number 13
a silvery ductile metallic element found primarily in bauxite
double salt
a solution of two simple salts that forms a single substance on crystallization

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