AM_Gypsum_12 Formula: Ca S O6 H4 Name: Gypsum Unit cell: 6.284 15.2 6.523 90.0 127.41 90.0 , V=494.90 Space group: C12/C1 (15)

Boeyens J C A , Ichharam V V H , Zeitschrift fur Kristallographie , 217 (2002) p.9-10, Redetermination of the crystal structure of calcium sulphate dihydrate, CaSO4*2H2O, Locality: synthetic