Chalcopyrite
      Burdick C, Ellis J
      Journal of the American Chemical Society 39 (1917) 2519-2525
      The Crystal Structure of Chalcopyrite Determined by X-Rays
      _cod_database_code 1010929
      _database_code_amcsd 0017651

      CELL PARAMETERS:    5.2280   5.2280   5.2280   90.000   90.000   90.000
      SPACE GROUP: F-43m     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    142.892
      Density (g/cm3):      4.265
      MAX. ABS. INTENSITY / VOLUME**2:      113.1891024    
      RIR:      8.642
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                29.60        100.00        3.0184    1   1   1         4
                34.31          9.45        2.6140    2   0   0         6
                49.30         55.46        1.8484    2   2   0        12
                58.56         34.10        1.5763    3   1   1        12
                61.44          2.09        1.5092    2   2   2         4
                72.29          7.18        1.3070    4   0   0         6
                80.00         11.42        1.1994    3   3   1        12
                82.52          2.07        1.1690    4   2   0        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.