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, 4H structure
      Note: theoretically calculated structure values
      _database_code_amcsd 0014067

      CELL PARAMETERS:    2.5221   2.5221   8.2371   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     45.376
      Density (g/cm3):      3.516
      MAX. ABS. INTENSITY / VOLUME**2:      5.548104965    
      RIR:      0.514
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                41.34         27.75        2.1842    1   0   0         6
                42.83        100.00        2.1112    1   0   1        12
                43.97         57.91        2.0593    0   0   4         2
                47.10         43.38        1.9296    1   0   2        12
                53.62          2.21        1.7093    1   0   3        12
                61.93          5.42        1.4983    1   0   4        12
                71.77         18.01        1.3153    1   0   5        12
                75.37         42.30        1.2610    1   1   0         6
                83.10         30.42        1.1623    1   0   6        12
                89.81          1.65        1.0921    2   0   0         6
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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.