Anhydrite Antao S Powder Diffraction 26 (2011) 326-330 Crystal-structure analysis of four mineral samples of anhydrite, Ca(SO4), using synchrotron high-resolution powder X-ray diffraction data _database_code_amcsd 0020858 7.00136 6.99339 6.24171 90 90 90 Amma atom x y z Uiso Ca .75 0 .34631 .0081 S .25 0 .1551 .0075 O1 .25 .1721 .0159 .0088 O2 .0798 0 .2976 .0091