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: 7
      _database_code_amcsd 0007872

      CELL PARAMETERS:    7.4953   8.6203   4.7305   90.000   90.000   90.000
      SPACE GROUP: C222_1    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    305.646
      Density (g/cm3):      2.611
      MAX. ABS. INTENSITY / VOLUME**2:      13.11581118    
      RIR:      1.636
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                15.67         29.14        5.6562    1   1   0         4
                20.61         19.87        4.3102    0   2   0         2
                23.74         76.91        3.7476    2   0   0         2
                24.53         69.14        3.6287    1   1   1         4
                28.01        100.00        3.1860    0   2   1         4
                30.43         21.39        2.9375    2   0   1         4
                31.64          8.99        2.8281    2   2   0         4
                33.40          4.88        2.6830    1   3   0         4
                37.03         30.28        2.4274    2   2   1         4
                38.58          9.23        2.3338    1   3   1         4
                41.38          9.97        2.1821    1   1   2         4
                41.92          2.23        2.1551    0   4   0         2
                42.23          6.03        2.1401    3   1   1         4
                45.34          3.69        2.0002    2   0   2         4
                46.29          5.87        1.9612    0   4   1         4
                48.27          4.00        1.8854    3   3   0         4
                48.59          2.47        1.8738    4   0   0         2
                50.29         13.84        1.8143    2   2   2         4
                51.51          7.11        1.7743    1   3   2         4
                52.53          7.05        1.7421    4   0   1         4
                52.68         10.31        1.7376    2   4   1         4
                54.47          1.94        1.6845    3   1   2         4
                54.62          1.87        1.6802    1   5   0         4
                57.02         11.20        1.6152    4   2   1         4
                57.89          4.12        1.5930    0   4   2         4
                58.28          1.66        1.5833    1   5   1         4
                61.00          1.49        1.5189    1   1   3         4
                62.93          1.18        1.4769    5   1   0         4
                63.45          5.05        1.4661    2   4   2         4
                64.07          2.63        1.4534    2   0   3         4
                64.90          2.24        1.4367    0   6   0         2
                66.30          3.49        1.4098    5   1   1         4
                67.35         10.98        1.3903    4   2   2         4
                68.08          3.86        1.3772    2   2   3         4
                68.50          9.26        1.3698    1   5   2         4
                69.09          9.03        1.3594    1   3   3         4
                69.11          4.18        1.3592    3   5   1         4
                69.36          1.70        1.3548    4   4   1         4
                70.15          4.07        1.3415    2   6   0         4
                70.91          3.87        1.3291    5   3   0         4
                74.10          1.90        1.2795    5   3   1         4
                74.57          1.62        1.2726    0   4   3         4
                75.96          1.74        1.2527    5   1   2         4
                76.21          1.25        1.2492    6   0   0         2
                78.63          3.18        1.2168    3   5   2         4
                78.87          5.22        1.2137    4   4   2         4
                79.19          3.75        1.2096    3   3   3         4
                79.43          3.30        1.2065    4   0   3         4
                79.55          1.30        1.2050    2   4   3         4
                81.84          5.26        1.1770    1   7   1         4
                83.04          3.09        1.1630    6   2   1         4
                83.51          2.00        1.1576    1   1   4         4
                85.06          1.20        1.1405    0   2   4         4
                86.24          1.69        1.1278    2   0   4         4
                88.52          2.16        1.1046    3   7   0         4
                88.97          3.36        1.1002    5   5   1         4
                89.91          1.06        1.0911    2   2   4         4
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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.