Magnesium
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Hexagonal closest packed, hcp, structure
      _database_code_amcsd 0011183

      CELL PARAMETERS:    3.2093   3.2093   5.2103   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     46.474
      Density (g/cm3):      1.737
      MAX. ABS. INTENSITY / VOLUME**2:      20.57080118    
      RIR:      3.857
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                32.21         24.17        2.7793    1   0   0         6
                34.43         26.65        2.6052    0   0   2         2
                36.65        100.00        2.4522    1   0   1        12
                47.86         14.63        1.9007    1   0   2        12
                57.43         15.74        1.6046    1   1   0         6
                63.12         16.81        1.4729    1   0   3        12
                67.39          2.21        1.3897    2   0   0         6
                68.70         16.44        1.3663    1   1   2        12
                70.08         11.46        1.3427    2   0   1        12
                72.58          2.24        1.3026    0   0   4         2
                77.92          2.61        1.2261    2   0   2        12
                81.63          2.23        1.1795    1   0   4        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.