Hafnium
      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 0011178

      CELL PARAMETERS:    3.1967   3.1967   5.0578   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     44.761
      Density (g/cm3):     13.241
      MAX. ABS. INTENSITY / VOLUME**2:      990.3317541    
      RIR:     24.353
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                32.34         24.38        2.7684    1   0   0         6
                35.50         25.06        2.5289    0   0   2         2
                37.02        100.00        2.4284    1   0   1        12
                48.77         14.26        1.8671    1   0   2        12
                57.67         16.13        1.5984    1   1   0         6
                64.74         16.04        1.4399    1   0   3        12
                67.69          2.28        1.3842    2   0   0         6
                69.58         16.52        1.3511    1   1   2        12
                70.54         11.80        1.3351    2   0   1        12
                75.13          2.10        1.2644    0   0   4         2
                78.83          2.68        1.2142    2   0   2        12
                84.18          2.17        1.1502    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.