Pollucite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050344
      Newnham R E
      American Mineralogist 52 (1967) 1515-1518
      Crystal structure and optical properties of pollucite

      CELL PARAMETERS:   13.68053   13.68053   13.68053   90.00000   90.00000   90.00000
      SPACE GROUP: Ia-3d
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                18.37          2.07        4.8368    2   2   0
                24.37         37.33        3.6563    3   2   1
                26.08        100.00        3.4201    4   0   0
                29.22          2.55        3.0591    4   2   0
                30.67         46.50        2.9167    3   3   2
                33.42          5.12        2.6830    4   3   1
                35.97          4.73        2.4977    5   2   1
                37.19         27.65        2.4184    4   4   0
                40.67         12.72        2.2193    5   3   2
                41.77          1.10        2.1631    6   2   0
                44.95          7.15        2.0171    6   3   1
                45.97          3.00        1.9746    4   4   4
                47.96          2.25        1.8971    6   4   0
                48.93          8.06        1.8617    6   3   3
                48.93          6.91        1.8617    7   2   1
                48.93          2.20        1.8617    5   5   2
                52.68          1.39        1.7374    6   5   1
                52.68         20.38        1.7374    7   3   2
                53.59          6.03        1.7101    8   0   0
                54.49          2.13        1.6840    7   4   1
                56.26          2.84        1.6351    6   5   3
                57.99          1.92        1.5903    8   3   1
                59.69          4.50        1.5490    7   5   2
                60.52          7.51        1.5295    8   4   0
                63.00          3.14        1.4752    7   6   1
                66.22          6.24        1.4110    7   6   3
                67.01          2.62        1.3963    8   4   4
                68.58          1.06        1.3681    8   6   0
                69.36          4.96        1.3546    7   7   2
                69.36          3.74        1.3546   10   1   1
                72.44          1.76        1.3044    7   6   5
                72.44          1.27        1.3044    9   5   2
                72.44          5.13        1.3044   10   3   1
                73.95          1.81        1.2813    8   7   1
                75.46          2.14        1.2594   10   3   3
                78.45          4.59        1.2188   10   5   1
                79.19          1.07        1.2092    8   8   0
                81.40          1.13        1.1818   11   3   2
                81.40          1.65        1.1818    7   7   6
                81.40          2.34        1.1818   10   5   3
                85.06          1.42        1.1400    8   8   4
                87.24          1.42        1.1170   11   5   2
                87.24          1.57        1.1170   10   7   1
                87.24          2.24        1.1170   10   5   5
                87.24          2.24        1.1170   10   5   5
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.