Caesium cadmium chloride (CsCdCl 3) is a synthetic crystalline material. It belongs to the AMX 3 group (where A=alkali metal, M=bivalent metal, X=halogen ions). It crystallizes in a hexagonal space group P6 3 / mmc with unit cell lengths a = 7.403 Å and c = 18.406 Å, with one cadmium ion having D 3d symmetry and the other having C 3v symmetry.