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: hexagonal, 6H structure
      Note: theoretically calculated structure values
      _database_code_amcsd 0014068

      CELL PARAMETERS:    2.5221   2.5221  12.3557   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     68.065
      Density (g/cm3):      3.516
      MAX. ABS. INTENSITY / VOLUME**2:      8.032082501    
      RIR:      0.744
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                42.01         40.95        2.1509    1   0   1        12
                43.97         60.00        2.0593    1   0   2        12
                43.97         40.00        2.0593    0   0   6         2
                47.10         17.76        1.9296    1   0   3        12
                56.21          2.16        1.6366    1   0   5        12
                68.33          5.85        1.3729    1   0   7        12
                75.37         29.22        1.2610    1   1   0         6
                75.37         14.61        1.2610    1   0   8        12
                83.10         12.45        1.1623    1   0   9        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.