Phase-F
      Kudoh Y, Nagase T, Sasaki S, Tanaka M, Kanzaki M
      Physics and Chemistry of Minerals 22 (1995) 295-299
      Phase F, a new hydrous magnesium silicate synthesized at 1000 C
      and 17 GPa: Crystal structure and estimated bulk modulus
      Note: The authors withdrew this structure, it is not Phase-F
      See PCM 24 (1997) 610
      _database_code_amcsd 0007918

      CELL PARAMETERS:    5.0730   5.0730  14.0130   90.000   90.000  120.000
      SPACE GROUP: P6_3cm    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    312.314
      Density (g/cm3):      3.085
      MAX. ABS. INTENSITY / VOLUME**2:      4.735759380    
      RIR:      0.500
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.63         13.66        7.0065    0   0   2         1
                20.21         20.68        4.3933    1   0   0         6
                23.91         50.64        3.7221    1   0   2         6
                25.42          3.66        3.5032    0   0   4         1
                32.69         24.47        2.7391    1   0   4         6
                35.39         17.45        2.5365    1   1   0         6
                35.98          5.16        2.4959    1   1   1         6
                37.72          2.35        2.3850    1   1   2         6
                40.47        100.00        2.2290    1   1   3         6
                43.16          4.27        2.0961    2   0   2         6
                43.90          5.95        2.0622    1   0   6         6
                44.08         94.24        2.0545    1   1   4         6
                48.40         35.34        1.8806    1   1   5         6
                48.94         10.95        1.8611    2   0   4         6
                53.32          3.67        1.7181    1   1   6         6
                55.75          1.46        1.6490    2   1   1        12
                56.56          1.39        1.6271    1   0   8         6
                57.00          3.70        1.6158    2   1   2        12
                57.60          3.76        1.6001    2   0   6         6
                58.76         26.74        1.5714    1   1   7         6
                59.04          2.68        1.5646    2   1   3        12
                61.83          5.66        1.5005    2   1   4        12
                63.53         66.18        1.4644    3   0   0         6
                64.67         48.53        1.4413    1   1   8         6
                68.51          2.08        1.3695    2   0   8         6
                69.45          2.75        1.3533    2   1   6        12
                70.54          1.16        1.3350    1   0  10         6
                71.04          1.41        1.3269    1   1   9         6
                74.87          1.58        1.2682    2   2   0         6
                76.83          1.33        1.2407    3   0   6         6
                78.08          3.62        1.2239    2   2   3         6
                78.50          1.24        1.2185    3   1   0        12
                79.91          1.88        1.2005    3   1   2        12
                80.55          4.33        1.1925    2   2   4         6
                82.63          3.06        1.1678    0   0  12         1
                83.70          2.46        1.1554    2   2   5         6
                84.11          2.21        1.1509    3   1   4        12
                86.17          1.15        1.1286    1   0  12         6
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.