Tridymite
      Lee S, Xu H
      Acta Crystallographica B75 (2019) https://doi.org/10.1107/S2052520619000933
      Using powder XRD and pair distribution function to determine anisotropic
      atomic displacement parameters of orthorhombic tridymite and
      tetragonal cristobalite
      Locality: rhyolitic rock, New Mexico, USA
      _database_code_amcsd 0020744

      CELL PARAMETERS:    8.7549   5.0335   8.2118   90.000   90.000   90.000
      SPACE GROUP: C222_1    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    361.876
      Density (g/cm3):      2.205
      MAX. ABS. INTENSITY / VOLUME**2:      12.49943006    
      RIR:      1.845
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                20.29         58.22        4.3774    2   0   0         2
                20.35        100.00        4.3637    1   1   0         4
                21.64         87.66        4.1059    0   0   2         2
                23.02         30.01        3.8629    2   0   1         4
                23.08         61.73        3.8534    1   1   1         4
                29.83          9.81        2.9947    2   0   2         4
                29.88         26.78        2.9903    1   1   2         4
                35.56         21.15        2.5247    3   1   0         4
                35.67          9.62        2.5168    0   2   0         2
                37.26          1.31        2.4132    3   1   1         4
                37.37          1.46        2.4063    0   2   1         4
                38.80          5.54        2.3209    2   0   3         4
                38.84          7.29        2.3188    1   1   3         4
                42.01          1.15        2.1506    3   1   2         4
                42.76          4.05        2.1149    4   0   1         4
                42.89          9.03        2.1087    2   2   1         4
                44.11          5.82        2.0529    0   0   4         2
                47.05          2.97        1.9314    4   0   2         4
                47.17          4.76        1.9267    2   2   2         4
                49.04          6.24        1.8576    1   1   4         4
                53.61          2.00        1.7094    4   0   3         4
                53.72          4.17        1.7062    2   2   3         4
                55.57          3.33        1.6538    5   1   0         4
                55.65          2.31        1.6515    4   2   0         4
                55.79          1.43        1.6478    1   3   0         4
                56.79          3.06        1.6212    5   1   1         4
                56.87          3.78        1.6191    4   2   1         4
                57.00          4.78        1.6156    1   3   1         4
                60.18          3.45        1.5377    2   0   5         4
                60.20          4.77        1.5371    1   1   5         4
                60.34          1.34        1.5340    5   1   2         4
                60.42          1.62        1.5322    4   2   2         4
                60.54          1.54        1.5293    1   3   2         4
                62.08          2.13        1.4951    2   2   4         4
                63.79          1.22        1.4591    6   0   0         2
                64.01          1.63        1.4546    3   3   0         4
                65.13          1.25        1.4323    3   3   1         4
                66.00          2.30        1.4155    5   1   3         4
                66.07          1.50        1.4141    4   2   3         4
                66.20          1.95        1.4118    1   3   3         4
                71.87          1.71        1.3137    4   0   5         4
                71.96          3.25        1.3122    2   2   5         4
                72.36          1.06        1.3059    1   1   6         4
                73.73          1.12        1.2851    1   3   4         4
                75.28          3.28        1.2623    6   2   0         4
                76.32          2.63        1.2477    6   2   1         4
                76.60          3.12        1.2439    0   4   1         4
                79.42          1.81        1.2066    6   2   2         4
                79.69          2.78        1.2032    3   1   6         4
                80.23          1.23        1.1965    2   4   1         4
                82.83          2.09        1.1653    5   1   5         4
                82.90          1.33        1.1646    4   2   5         4
                83.02          1.81        1.1633    1   3   5         4
                83.35          1.29        1.1594    2   2   6         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.