Carbon
      Ownby P D, Yang X, Liu J
      Journal of the American Ceramic Society 75 (1992) 1876-1883
      Calculated X-ray diffraction data for diamond polytypes
      Note: cubic, 3C structure
      Note: theoretically calculated structure values
      _database_code_amcsd 0014065

      CELL PARAMETERS:    3.5667   3.5667   3.5667   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     45.373
      Density (g/cm3):      3.516
      MAX. ABS. INTENSITY / VOLUME**2:      12.85152220    
      RIR:      1.190
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                43.97        100.00        2.0592    1   1   1         8
                75.37         36.52        1.2610    2   2   0        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.