Weddellite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050242
      Tazzoli V, Domeneghetti M C
      American Mineralogist 65 (1980) 327-334
      The crystal structures of whewellite and weddellite: re-examination and
      comparison

      CELL PARAMETERS:   12.37100   12.37100   7.357000   90.00000   90.00000   90.00000
      SPACE GROUP: I4/m
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                10.13          5.57        8.7464    1   1   0
                14.02          3.62        6.3229    1   0   1
                14.33        100.00        6.1847    2   0   0
                20.09         31.32        4.4213    1   2   1
                20.31          1.20        4.3732    2   2   0
                22.74         15.92        3.9115    1   3   0
                24.20          8.08        3.6784    0   0   2
                24.75          2.24        3.5967    3   0   1
                26.28          3.83        3.3907    1   1   2
                28.23          5.99        3.1615    2   0   2
                28.71          1.16        3.1092    3   2   1
                28.87         17.75        3.0923    4   0   0
                31.78         13.91        2.8150    2   2   2
                32.22         99.82        2.7779    1   4   1
                32.36          2.98        2.7659    4   2   0
                33.43          1.38        2.6796    1   3   2
                37.05         12.48        2.4258    1   5   0
                37.37         14.85        2.4054    1   0   3
                38.00          3.27        2.3670    4   0   2
                38.38          3.13        2.3448    4   3   1
                38.38          4.50        2.3448    3   4   1
                39.43          2.67        2.2848    3   3   2
                40.21         28.42        2.2418    2   1   3
                40.81          1.55        2.2106    4   2   2
                40.81          9.89        2.2106    2   4   2
                42.60         11.74        2.1213    3   5   0
                42.60          5.50        2.1213    5   3   0
                44.73          8.39        2.0251    5   1   2
                45.45          4.63        1.9950    2   3   3
                46.30          4.91        1.9600    6   1   1
                46.30         13.00        1.9600    1   6   1
                46.41          1.43        1.9558    6   2   0
                46.41          1.64        1.9558    2   6   0
                47.89         14.66        1.8986    4   1   3
                47.89          7.29        1.8986    1   4   3
                49.54          1.48        1.8392    0   0   4
                49.59         15.56        1.8376    5   3   2
                49.59          1.79        1.8376    3   5   2
                50.74          1.47        1.7984    6   0   2
                51.04          2.46        1.7886    6   3   1
                51.04          1.87        1.7886    3   6   1
                51.84          1.62        1.7629    2   0   4
                52.27          1.36        1.7493    5   5   0
                52.27          2.43        1.7493    1   7   0
                52.52          5.77        1.7416    3   4   3
                52.52          1.97        1.7416    4   3   3
                54.07          4.93        1.6954    2   2   4
                55.48          1.46        1.6555    2   7   1
                56.64          1.92        1.6242    7   3   0
                58.39          2.13        1.5797    5   5   2
                58.98          3.64        1.5653    6   1   3
                61.73          2.40        1.5019    7   4   1
                61.82          2.10        1.5000    2   8   0
                61.82          1.58        1.5000    8   2   0
                62.48          2.16        1.4858    7   3   2
                62.48          1.70        1.4858    3   7   2
                64.80          1.94        1.4379    7   5   0
                65.02          1.16        1.4336    7   0   3
                65.44          1.93        1.4254    8   0   2
                67.35          1.55        1.3896    5   3   4
                67.35          3.43        1.3896    3   5   4
                67.38          1.28        1.3890    2   8   2
                67.38          1.08        1.3890    8   2   2
                70.25          1.80        1.3392    5   7   2
                71.36          1.55        1.3210    1   4   5
                71.43          1.55        1.3199    9   2   1
                72.65          1.27        1.3006    8   1   3
                76.98          1.05        1.2380    9   4   1
                77.86          1.20        1.2261    0   0   6
                80.53          2.42        1.1920    1   6   5
                80.53          2.15        1.1920    6   1   5
                82.16          1.96        1.1724   10   0   2
                83.96          1.22        1.1519    2  10   2
                84.12          1.32        1.1501    3   6   5
                87.14          1.14        1.1178    4   9   3
                89.53          1.49        1.0940    2  11   1
                89.53          1.49        1.0940    2  11   1
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.