Chromium
      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 0011170

      CELL PARAMETERS:    2.7220   2.7220   4.4270   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     28.406
      Density (g/cm3):      6.078
      MAX. ABS. INTENSITY / VOLUME**2:      142.1275717    
      RIR:      7.614
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                38.18         25.27        2.3573    1   0   0         6
                40.76         27.42        2.2135    0   0   2         2
                43.49        100.00        2.0807    1   0   1        12
                57.08         12.95        1.6136    1   0   2        12
                69.00         12.92        1.3610    1   1   0         6
                76.10         13.71        1.2508    1   0   3        12
                81.70          1.81        1.1787    2   0   0         6
                83.36         13.63        1.1594    1   1   2        12
                85.20          9.58        1.1390    2   0   1        12
                88.30          1.93        1.1068    0   0   4         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.