Gypsum Wooster W Zeitschrift fur Kristallographie 94 (1936) 375-396 On the crystal structure of gypsum Ca S O4 (H2 O)2 _cod_database_code 1010981 _database_code_amcsd 0017897 10.47 15.15 6.51 90 151.55 90 C2/c atom x y z Ca1 0 .42 .25 S1 0 .083 -.25 O1 .033 .14 -.018 O2 .241 .026 .066 O3 .128 .314 .165