Cristobalite
      Pluth J J, Smith J V, Faber J
      Journal of Applied Physics 57 (1985) 1045-1049
      Crystal structure of low cristobalite at 10, 293, and 473 K:
      Variation of framework geometry with temperature
      Sample: T = 473 K
      Locality: synthetic
      _database_code_amcsd 0012930

      CELL PARAMETERS:    4.9877   4.9877   6.9697   90.000   90.000   90.000
      SPACE GROUP: P4_12_12  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    173.386
      Density (g/cm3):      2.301
      MAX. ABS. INTENSITY / VOLUME**2:      36.36026556    
      RIR:      5.144
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.91        100.00        4.0561    1   0   1         8
                28.36          7.50        3.1469    1   1   1         8
                31.31          8.91        2.8567    1   0   2         8
                36.01         12.83        2.4938    2   0   0         4
                36.24          5.37        2.4789    1   1   2         8
                42.55          2.44        2.1244    2   1   1         8
                44.68          2.65        2.0280    2   0   2         8
                46.83          4.11        1.9401    1   1   3         8
                48.45          4.41        1.8787    2   1   2         8
                53.94          2.05        1.6999    2   0   3         8
                56.94          3.84        1.6172    3   0   1         8
                57.26          1.66        1.6090    2   1   3         8
                60.15          2.01        1.5383    3   1   1         8
                61.83          2.04        1.5005    3   0   2         8
                64.89          2.55        1.4369    3   1   2         8
                65.33          1.37        1.4283    2   0   4         8
                66.58          1.18        1.4046    2   2   3         8
                68.31          1.94        1.3731    2   1   4         8
                70.09          1.42        1.3425    1   0   5         8
                72.42          1.56        1.3049    3   1   3         8
                73.68          1.64        1.2857    3   2   2         8
                79.18          1.29        1.2097    4   1   0         8
                80.87          1.25        1.1886    3   2   3         8
                81.41          1.28        1.1821    2   1   5         8
                88.65          1.30        1.1033    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.