Beryllium
      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 0011165

      CELL PARAMETERS:    2.2866   2.2866   3.5833   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     16.225
      Density (g/cm3):      1.844
      MAX. ABS. INTENSITY / VOLUME**2:      2.862946886    
      RIR:      0.505
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                45.82         26.28        1.9803    1   0   0         6
                50.97         24.88        1.7917    0   0   2         2
                52.82        100.00        1.7332    1   0   1        12
                70.94         13.56        1.3286    1   0   2        12
                84.80          5.63        1.1433    1   1   0         6
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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.