double saltn. a salt which is composed of two simple salts and which when crystallized has physical properties different from its components but which in aqueous solution behaves as a mixture of them.
ΚΠ
1849 D. CampbellPract. Text-bk. Inorg. Chem. 176 These double salts are known as manganese alums.
1948 S. GlasstoneTextbk. Physical Chem. (ed. 2) x. 807 When a double salt can exist as a solid phase the behavior on evaporation depends on whether the compound is stable in contact with water or not.