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: 18
      _database_code_amcsd 0007883

      CELL PARAMETERS:    4.1154   4.4201  15.5724   90.000   90.000   90.000
      SPACE GROUP: I2_12_12_1
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    283.269
      Density (g/cm3):      2.817
      MAX. ABS. INTENSITY / VOLUME**2:      21.07444882    
      RIR:      2.436
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                20.89        100.00        4.2521    0   1   1         4
                22.34         13.64        3.9788    1   0   1         4
                26.49          7.33        3.3653    0   1   3         4
                27.66         36.26        3.2248    1   0   3         4
                35.25          1.31        2.5459    0   1   5         4
                36.17          5.72        2.4835    1   0   5         4
                37.76         87.78        2.3823    1   1   4         4
                45.65          2.04        1.9871    0   1   7         4
                49.19          4.49        1.8522    2   1   1         4
                50.03          8.49        1.8230    1   2   3         4
                55.67          9.22        1.6510    1   2   5         4
                57.17          1.09        1.6112    0   1   9         4
                57.60          1.52        1.6004    2   1   5         4
                61.58         11.63        1.5060    2   2   0         4
                63.49          1.01        1.4651    1   2   7         4
                63.71         11.39        1.4607    0   2   8         4
                65.28          6.17        1.4294    2   1   7         4
                66.07         11.30        1.4141    2   0   8         4
                72.31          6.38        1.3067    1   3   4         4
                74.85          3.33        1.2686    2   1   9         4
                75.77          1.92        1.2554    3   0   5         4
                76.76          6.07        1.2417    3   1   4         4
                77.74          2.75        1.2284    0   3   7         4
                80.40          4.61        1.1944    2   3   1         4
                80.61          5.84        1.1918    1   1  12         4
                80.66          1.02        1.1911    2   2   8         4
                84.64          2.48        1.1450    1   2  11         4
                85.36          2.95        1.1372    3   2   3         4
                86.82          1.63        1.1218    0   3   9         4
                88.48          1.06        1.1050    0   4   0         2
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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.