Anhydrite Hohne E Soviet Physics Crystallography 7 (1962) 559-569 A more accurate determination of the crystal structure of anhydrite, CaSO4 _database_code_amcsd 0019829 6.23 6.98 6.97 90 90 90 Bbmm atom x y z Ca .346 .75 0 S .154 .25 0 O1 .296 .080 0 O2 .020 .25 .173