Magnesite
      Liang W, Li Z, Yin Y, Li R, Chen L, He Y, Dong H, Dai L, Li H
      Physics and Chemistry of Minerals 45 (2018) 423-434
      Single crystal growth, characterization and high-pressure
      Raman spectroscopy of impurity-free magnesite (MgCO3)
      Locality: synthetic
      _database_code_amcsd 0021223

      CELL PARAMETERS:    4.6255   4.6255  14.9870   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    277.692
      Density (g/cm3):      3.025
      MAX. ABS. INTENSITY / VOLUME**2:      16.83637704    
      RIR:      1.812
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                32.73        100.00        2.7364    1   0   4         6
                35.95         13.21        2.4978    0   0   6         2
                38.94          6.12        2.3128    1   1   0         6
                43.10         50.75        2.0988    1   1   3        12
                46.96         13.30        1.9350    2   0   2         6
                51.75          5.31        1.7664    0   2   4         6
                54.04         23.71        1.6970    1   1   6        12
                54.04         18.25        1.6970    0   1   8         6
                61.56          4.98        1.5064    2   1   1        12
                62.59          7.55        1.4841    1   2   2        12
                66.62          6.27        1.4038    2   1   4        12
                68.59          2.15        1.3682    2   0   8         6
                69.56          2.94        1.3514    1   2   5        12
                69.57          6.88        1.3514    1   1   9        12
                70.53         13.30        1.3353    3   0   0         6
                76.23          4.86        1.2489    0   0  12         2
                77.16          1.92        1.2362    2   1   7        12
                79.95          1.98        1.2000    0   2  10         6
                81.79          3.25        1.1776    1   2   8        12
                89.10          1.27        1.0989    1   1  12        12
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.