Ankerite Ross N L, Reeder R J American Mineralogist 77 (1992) 412-421 High-pressure structural study of dolomite and ankerite P = 1.90 GPa _database_code_amcsd 0001450 4.8163 4.8163 15.992 90 90 120 R-3 atom x y z occ Biso CaA 0 0 0 .997 1.26 MgB 0 0 .5 .273 0.34 FeB 0 0 .5 .676 0.34 MnB 0 0 .5 .054 0.34 C 0 0 .2432 0.95 O .2519 -.0292 .2455 1.17