Magnesite
      Bromiley F A, Boffa Ballaran T, Langenhorst F, Seifert F
      American Mineralogist 92 (2007) 829-836
      Order and miscibility in the otavite - magnesite solid solution
      Locality: synthetic
      Sample: X_Mg = .5, synthesized at 800 C, 1 GPa, 1 h
      _database_code_amcsd 0004344

      CELL PARAMETERS:    4.7788   4.7788  15.6968   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    310.441
      Density (g/cm3):      4.119
      MAX. ABS. INTENSITY / VOLUME**2:      53.20238644    
      RIR:      4.206
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                24.31         43.90        3.6608    0   1   2         6
                31.41        100.00        2.8476    1   0   4         6
                37.65         23.67        2.3894    1   1   0         6
                41.55         11.04        2.1735    1   1   3        12
                45.32         19.58        2.0009    2   0   2         6
                49.82         10.10        1.8304    0   2   4         6
                51.55         17.30        1.7729    0   1   8         6
                51.82         25.88        1.7643    1   1   6        12
                59.38          1.39        1.5565    2   1   1        12
                60.34         12.15        1.5341    1   2   2        12
                63.37          2.52        1.4677    1   0  10         6
                64.09          8.13        1.4530    2   1   4        12
                65.57          3.45        1.4238    2   0   8         6
                66.36          1.24        1.4087    1   1   9        12
                67.95          6.72        1.3795    3   0   0         6
                72.22          2.39        1.3081    0   0  12         2
                76.11          2.44        1.2506    0   2  10         6
                78.14          3.63        1.2231    1   2   8        12
                84.43          2.34        1.1474    1   1  12        12
                88.18          2.59        1.1080    2   1  10        12
                88.82          1.31        1.1017    1   3   4        12
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.