Lonsdaleite
      Fayos J
      Journal of Solid State Chemistry 148 (1999) 278-285
      Possible 3D carbon structures as progressive intermediates in graphite
      to diamond phase transition
      Note: mathematical model, phase: diamond(hex)
      _database_code_amcsd 0013990

      CELL PARAMETERS:    2.5200   2.5200   4.1200   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     22.658
      Density (g/cm3):      3.520
      MAX. ABS. INTENSITY / VOLUME**2:      6.154320642    
      RIR:      0.569
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                41.37        100.00        2.1824    1   0   0         6
                43.95         52.42        2.0600    0   0   2         2
                47.12         52.16        1.9285    1   0   1        12
                61.94         19.57        1.4980    1   0   2        12
                75.45         38.11        1.2600    1   1   0         6
                83.10         36.66        1.1623    1   0   3        12
                89.90          5.97        1.0912    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.