Carbon
      Bucknum M J, Castro E A
      Journal of Chemical Theory and Computation 2 (2006) 775-781
      The carbon allotrope hexagonite and its potential
      synthesis from cold compression of carbon nanotubes
      Locality: hypothetical structure
      _database_code_amcsd 0013020

      CELL PARAMETERS:    4.8900   4.8900   3.8800   90.000   90.000  120.000
      SPACE GROUP: P6/mmm    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     80.349
      Density (g/cm3):      2.482
      MAX. ABS. INTENSITY / VOLUME**2:      19.71999210    
      RIR:      2.587
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                20.98        100.00        4.2349    1   0   0         6
                22.92          4.13        3.8800    0   0   1         2
                36.76          3.92        2.4450    1   1   0         6
                42.70          8.76        2.1174    2   0   0         6
                43.76          7.15        2.0685    1   1   1        12
                46.83          3.48        1.9400    0   0   2         2
                49.01         10.15        1.8587    2   0   1        12
                51.84          2.42        1.7637    1   0   2        12
                57.58          5.20        1.6006    2   1   0        12
                71.06          1.04        1.3266    3   0   1        12
                77.28          1.06        1.2346    2   1   2        24
                78.19          1.76        1.2225    2   2   0         6
                84.80          2.81        1.1432    1   1   3        12
                88.61          4.70        1.1037    2   0   3        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.