Pollucite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050345
      Newnham R E
      American Mineralogist 52 (1967) 1515-1518
      Crystal structure and optical properties of pollucite

      CELL PARAMETERS:   13.67930   13.67930   13.67930   90.00000   90.00000   90.00000
      SPACE GROUP: Ia-3d
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                18.36          2.07        4.8364    2   2   0
                24.36         37.33        3.6559    3   2   1
                26.07        100.00        3.4198    4   0   0
                29.20          2.55        3.0588    4   2   0
                30.66         46.50        2.9164    3   3   2
                33.40          5.12        2.6827    4   3   1
                35.96          4.73        2.4975    5   2   1
                37.18         27.65        2.4182    4   4   0
                40.65         12.72        2.2191    5   3   2
                41.76          1.10        2.1629    6   2   0
                44.94          7.15        2.0169    6   3   1
                45.96          3.00        1.9744    4   4   4
                47.95          2.25        1.8970    6   4   0
                48.92          8.06        1.8615    6   3   3
                48.92          6.91        1.8615    7   2   1
                48.92          2.20        1.8615    5   5   2
                52.67          1.39        1.7373    6   5   1
                52.67         20.38        1.7373    7   3   2
                53.58          6.03        1.7099    8   0   0
                54.48          2.13        1.6838    7   4   1
                56.25          2.84        1.6350    6   5   3
                57.98          1.92        1.5902    8   3   1
                59.68          4.50        1.5489    7   5   2
                60.52          7.51        1.5294    8   4   0
                62.99          3.14        1.4751    7   6   1
                66.21          6.24        1.4109    7   6   3
                67.00          2.62        1.3961    8   4   4
                68.57          1.06        1.3679    8   6   0
                69.35          4.96        1.3545    7   7   2
                69.35          3.74        1.3545   10   1   1
                72.43          1.76        1.3043    7   6   5
                72.43          1.27        1.3043    9   5   2
                72.43          5.13        1.3043   10   3   1
                73.95          1.81        1.2812    8   7   1
                75.46          2.14        1.2593   10   3   3
                78.44          4.59        1.2186   10   5   1
                79.18          1.07        1.2091    8   8   0
                81.39          1.13        1.1817   11   3   2
                81.39          1.65        1.1817    7   7   6
                81.39          2.34        1.1817   10   5   3
                85.05          1.42        1.1399    8   8   4
                87.24          1.42        1.1169   11   5   2
                87.24          1.57        1.1169   10   7   1
                87.24          2.24        1.1169   10   5   5
                87.24          2.24        1.1169   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.