Rhodochrosite Maslen E N, Streltsov V A, Streltsova N R, Ishizawa N Acta Crystallographica B51 (1995) 929-939 Electron density and optical anisotropy in rhombohedral carbonates. III. Synchrotron X-ray studies of CaCO3, MgCO3 and MnCO3 Sample: Mo Kalpha _database_code_amcsd 0009892 4.773 4.773 15.642 90 90 120 R-3c atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Mn 0 0 0 .00777 .00777 .00966 .003885 0 0 C 0 0 .25 .0064 .0064 .0074 .0032 0 0 O .2695 0 .25 .0068 .0103 .0123 .005015 -.0009 -.0018