ammonia alum

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Related to ammonia alum: ammonium aluminum sulfate
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Noun1.ammonia alum - a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
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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