Cristobalite
      Le Bail A
      Journal of Non-Crystalline Solids 183 (1995) 39-42
      Modelling the silica glass structure by the Rietveld method
      Note: model for amorphous silica based on cristobalite-type topology
      _database_code_amcsd 0020708

      CELL PARAMETERS:    7.2200   7.0900   7.3000   90.000   90.000   90.000
      SPACE GROUP: P2_12_12_1
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    373.686
      Density (g/cm3):      2.136
      MAX. ABS. INTENSITY / VOLUME**2:      37.83716961    
      RIR:      5.769
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.37        100.00        4.1579    1   1   1         4
                27.38          1.53        3.2574    1   0   2         4
                27.48          1.46        3.2452    0   1   2         4
                27.73          1.01        3.2170    2   1   0         4
                28.04          1.99        3.1821    1   2   0         4
                30.36          2.83        2.9438    2   1   1         4
                30.65          1.42        2.9170    1   2   1         4
                34.96          5.78        2.5667    2   0   2         4
                35.29          6.72        2.5430    0   2   2         4
                35.49          5.00        2.5294    2   2   0         4
                43.53          4.69        2.0790    2   2   2         4
                45.13          1.02        2.0092    3   0   2         4
                46.81          1.24        1.9407    2   1   3         4
                47.01          1.03        1.9330    1   2   3         4
                47.65          1.37        1.9085    2   3   1         4
                55.22          2.65        1.6634    3   1   3         4
                55.69          3.07        1.6504    1   3   3         4
                55.97          2.34        1.6430    3   3   1         4
                62.79          2.07        1.4800    2   2   4         4
                63.17          1.89        1.4719    4   2   2         4
                63.82          1.79        1.4585    2   4   2         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.