Gypsum Comodi P, Nazzareni S, Zanazzi P F, Speziale S American Mineralogist 93 (2008) 1530-1537 High-pressure behavior of gypsum: A single-crystal X-ray study Locality: Valle di Caramanico, Abruzzo, Italy Note: P = 0.25 GPa _database_code_amcsd 0004652 6.282 15.175 5.673 90 114.13 90 C2/c atom x y z Uiso Ca 0 .1697 .25 .009 S 0 .3285 .75 .007 O1 .084 .272 .592 .012 O2 .200 .383 .914 .013 WatOW -.211 .066 -.081 .020