Chromium
      Hull A W, Davey W P
      Physical Review 14 (1919) 540-540
      Crystal structure of chromium
      _database_code_amcsd 0015114

      CELL PARAMETERS:    2.9100   2.9100   2.9100   90.000   90.000   90.000
      SPACE GROUP: Im3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     24.642
      Density (g/cm3):      7.007
      MAX. ABS. INTENSITY / VOLUME**2:      242.2818785    
      RIR:     11.259
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                44.01        100.00        2.0577    1   1   0        12
                63.99         13.27        1.4550    2   0   0         6
                80.92         23.28        1.1880    2   1   1        24
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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.