Magnesite
      Fiquet G, Guyot F, Kunz M, Matas J, Andrault D, Hanfland M
      American Mineralogist 87 (2002) 1261-1265
      Structural refinements of magnesite at very high pressure
      Sample: P = 51.8 GPa
      Locality: Bahia, Brazil
      _database_code_amcsd 0002903

      CELL PARAMETERS:    4.3675   4.3675  13.1387   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    217.045
      Density (g/cm3):      3.870
      MAX. ABS. INTENSITY / VOLUME**2:      15.04434418    
      RIR:      1.266
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.21         10.24        3.2779    0   1   2         6
                36.22        100.00        2.4800    1   0   4         6
                41.23         13.16        2.1898    0   0   6         2
                41.34          6.67        2.1837    1   1   0         6
                46.47         78.64        1.9543    1   1   3        12
                50.20         11.98        1.8174    2   0   2         6
                56.12         11.22        1.6389    0   2   4         6
                59.81         30.68        1.5463    1   1   6        12
                61.56         15.42        1.5065    0   1   8         6
                65.70          1.52        1.4212    2   1   1        12
                66.99          6.06        1.3969    1   2   2        12
                72.05         11.83        1.3108    2   1   4        12
                75.39         23.15        1.2608    3   0   0         6
                76.88          3.77        1.2400    2   0   8         6
                78.87          7.82        1.2136    1   1   9        12
                89.51          4.60        1.0949    0   0  12         2
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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.