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 = 75.7 GPa
      Locality: Bahia, Brazil
      _database_code_amcsd 0002908

      CELL PARAMETERS:    4.2981   4.2981  12.6690   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    202.687
      Density (g/cm3):      4.144
      MAX. ABS. INTENSITY / VOLUME**2:      17.28706466    
      RIR:      1.358
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.80          5.67        3.2092    0   1   2         6
                37.28        100.00        2.4122    1   0   4         6
                42.04          7.08        2.1490    1   1   0         6
                42.83         11.05        2.1115    0   0   6         2
                47.47         68.49        1.9153    1   1   3        12
                51.15         13.47        1.7857    2   0   2         6
                57.43          8.80        1.6046    0   2   4         6
                61.57         26.41        1.5062    1   1   6        12
                63.88         14.51        1.4572    0   1   8         6
                66.92          2.65        1.3983    2   1   1        12
                68.29          6.55        1.3734    1   2   2        12
                73.68          9.89        1.2857    2   1   4        12
                76.83         19.88        1.2408    3   0   0         6
                77.62          1.39        1.2300    1   2   5        12
                79.46          2.95        1.2061    2   0   8         6
                81.79          6.43        1.1775    1   1   9        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.