Ice VII
      Kamb B, Davis B L
      Proceedings of the National Academy of Sciences 52 (1964) 1433-1439
      Ice VII, the densest form of ice
      Note: T = 223 K, P = 2.5 GPa
      Locality: synthetic
      _database_code_amcsd 0018369

      CELL PARAMETERS:    3.3000   3.3000   3.3000   90.000   90.000   90.000
      SPACE GROUP: Pn3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     35.937
      Density (g/cm3):      1.665
      MAX. ABS. INTENSITY / VOLUME**2:      16.55136048    
      RIR:      3.238
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                38.58        100.00        2.3335    1   1   0        12
                55.71          9.14        1.6500    2   0   0         6
                69.81         14.85        1.3472    2   1   1        24
                82.71          3.89        1.1667    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.