Ankerite Ross N L, Reeder R J American Mineralogist 77 (1992) 412-421 High-pressure structural study of dolomite and ankerite P = 4.00 GPa _database_code_amcsd 0001452 4.7990 4.7990 15.792 90 90 120 R-3 atom x y z occ Biso CaA 0 0 0 .997 1.00 MgB 0 0 .5 .273 0.66 FeB 0 0 .5 .676 0.66 MnB 0 0 .5 .054 0.66 C 0 0 .2441 0.89 O .2520 -.0290 .2453 1.04