double salt

nouns

a solution of two simple salts that forms a single substance on crystallization
is a type of (narrower)
a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal)
is a type of (narrower)
a homogeneous solid that can exist over a range of component chemicals; a constituent of alloys that is formed when atoms of an element are incorporated into the crystals of a metal