Cristobalite low
      Nieuwenkamp W
      Zeitschrift fur Kristallographie 92 (1935) 82-88
      Die Kristallstruktur des Tief-Cristobalits Si O2
      _cod_database_code 1010938
      _database_code_amcsd 0017659

      CELL PARAMETERS:    4.9640   4.9640   6.9200   90.000   90.000   90.000
      SPACE GROUP: P4_12_12  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    170.518
      Density (g/cm3):      2.340
      MAX. ABS. INTENSITY / VOLUME**2:      37.77579498    
      RIR:      5.256
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.04        100.00        4.0335    1   0   1         8
                28.51          9.05        3.1304    1   1   1         8
                31.52         10.13        2.8385    1   0   2         8
                36.19         13.52        2.4820    2   0   0         4
                36.46          4.82        2.4641    1   1   2         8
                42.78          2.37        2.1139    2   1   1         8
                44.95          3.00        2.0168    2   0   2         8
                47.15          5.04        1.9277    1   1   3         8
                48.74          5.67        1.8684    2   1   2         8
                54.29          2.65        1.6896    2   0   3         8
                57.25          4.39        1.6093    3   0   1         8
                57.63          1.55        1.5995    2   1   3         8
                60.47          2.85        1.5309    3   1   1         8
                62.19          2.86        1.4928    3   0   2         8
                65.27          2.49        1.4295    3   1   2         8
                65.80          1.48        1.4193    2   0   4         8
                67.00          1.71        1.3967    2   2   3         8
                68.80          2.84        1.3646    2   1   4         8
                69.63          1.07        1.3503    3   2   1         8
                70.66          1.89        1.3332    1   0   5         8
                72.89          2.38        1.2978    3   1   3         8
                74.12          2.44        1.2792    3   2   2         8
                78.27          1.36        1.2215    4   0   1         8
                79.63          1.92        1.2039    4   1   0         8
                81.40          1.70        1.1822    3   2   3         8
                82.05          1.76        1.1745    2   1   5         8
                89.40          1.38        1.0960    4   2   1         8
                89.43          2.00        1.0957    1   1   6         8
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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.