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: Synchrotron data _database_code_amcsd 0009891 4.772 4.772 15.637 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 .00944 .00944 .01125 .00472 0 0 C 0 0 .25 .0081 .0081 .0099 .00405 0 0 O .26975 0 .25 .0085 .0117 .0148 .00585 -.00099 -.00198