SiO2
      Boisen M B, Gibbs G V, Bukowinski M S T
      Physics and Chemistry of Minerals 21 (1994) 269-284
      Framework silica structures generated using simulated annealing
      with a potential energy function based on an H6Si2O7 molecule
      Sample: 9
      _database_code_amcsd 0007874

      CELL PARAMETERS:   11.1032   7.8989   4.9771   90.000  112.265   90.000
      SPACE GROUP: C2/c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    403.960
      Density (g/cm3):      1.976
      MAX. ABS. INTENSITY / VOLUME**2:      24.68724909    
      RIR:      4.069
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                14.14        100.00        6.2624    1   1   0         4
                17.26         12.04        5.1377    2   0   0         2
                21.14         47.19        4.2025   -1   1   1         4
                26.54          1.82        3.3587    1   1   1         4
                28.27          4.62        3.1564   -3   1   1         4
                28.40         27.62        3.1424    3   1   0         4
                29.80         24.54        2.9982    0   2   1         4
                34.93          2.01        2.5688    4   0   0         2
                35.19          1.93        2.5506    1   3   0         4
                36.20          8.55        2.4816   -2   0   2         2
                38.40          1.78        2.3439   -1   1   2         4
                39.67          1.58        2.2719   -3   1   2         4
                40.20          1.95        2.2431   -4   2   1         4
                41.95          4.62        2.1534    4   2   0         4
                42.08          3.90        2.1474    1   3   1         4
                43.26          1.33        2.0916   -3   3   1         4
                48.26          1.66        1.8857   -5   1   2         4
                50.79          1.38        1.7977   -2   4   1         4
                50.86          2.81        1.7954   -1   3   2         4
                52.11          5.45        1.7550    3   3   1         4
                52.30          1.29        1.7492    4   2   1         4
                53.51          2.12        1.7126    6   0   0         2
                56.86          1.43        1.6193   -3   1   3         4
                58.48          1.23        1.5782   -6   2   2         4
                59.00          2.06        1.5656    4   4   0         4
                60.74          3.88        1.5247   -2   2   3         4
                61.27          1.26        1.5130   -5   1   3         4
                61.90          1.18        1.4991    0   4   2         4
                64.58          1.91        1.4432    7   1   0         4
                65.01          2.21        1.4345    3   5   0         4
                68.28          1.43        1.3737   -1   3   3         4
                69.52          1.59        1.3522    2   4   2         4
                69.62          1.69        1.3505    6   2   1         4
                70.83          1.48        1.3303   -5   3   3         4
                75.17          1.65        1.2639    1   3   3         4
                76.11          1.01        1.2506    7   1   1         4
                77.97          1.01        1.2255   -5   5   2         4
                81.04          1.29        1.1866   -8   2   3         4
                81.13          1.09        1.1854   -4   6   1         4
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.