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 = 296 K
      Locality: synthetic
      _database_code_amcsd 0012929

      CELL PARAMETERS:    4.9709   4.9709   6.9278   90.000   90.000   90.000
      SPACE GROUP: P4_12_12  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    171.185
      Density (g/cm3):      2.331
      MAX. ABS. INTENSITY / VOLUME**2:      35.74076338    
      RIR:      4.993
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.01        100.00        4.0388    1   0   1         8
                28.47          9.03        3.1346    1   1   1         8
                31.48         11.22        2.8420    1   0   2         8
                36.14         13.91        2.4855    2   0   0         4
                36.42          4.25        2.4672    1   1   2         8
                42.72          2.72        2.1167    2   1   1         8
                44.89          2.45        2.0194    2   0   2         8
                47.09          5.10        1.9300    1   1   3         8
                48.67          5.20        1.8709    2   1   2         8
                54.22          2.57        1.6918    2   0   3         8
                57.16          3.95        1.6115    3   0   1         8
                57.55          1.22        1.6015    2   1   3         8
                60.38          2.63        1.5330    3   1   1         8
                62.10          2.99        1.4948    3   0   2         8
                65.17          2.20        1.4314    3   1   2         8
                65.71          1.44        1.4210    2   0   4         8
                66.90          1.39        1.3985    2   2   3         8
                68.70          2.37        1.3663    2   1   4         8
                69.52          1.03        1.3522    3   2   1         8
                70.56          1.86        1.3347    1   0   5         8
                72.78          2.28        1.2994    3   1   3         8
                74.00          2.22        1.2809    3   2   2         8
                78.14          1.14        1.2232    4   0   1         8
                79.50          1.48        1.2056    4   1   0         8
                81.27          1.30        1.1838    3   2   3         8
                81.93          1.45        1.1759    2   1   5         8
                89.25          1.02        1.0975    4   2   1         8
                89.30          1.59        1.0970    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.