Londonite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from the powder pattern of R050099
      Taxer K J, Buerger M J
      Zeitschrift fur Kristallographie 125 (1967) 423-436
      The crystal struture of rhodizite
      Note: name of mineral altered according to IMA decision in 1999
      to name the Cs dominant phase: londonite
      Locality: Manjaka, Madagascar

      CELL PARAMETERS:   7.3153  7.3153  7.3153   90.000   90.000   90.000
      SPACE GROUP: P-43m     

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Cs     0.00000   0.00000   0.00000     1.000     1.020
            B      0.24690   0.50000   0.00000     1.000     0.800
            Be     0.74900   0.74900   0.74900     1.000     1.400
            Al     0.36030   0.36030   0.36030     1.000     0.550
            O      0.62030   0.62030   0.62030     1.000     0.510
            O      0.36430   0.36430   0.10010     1.000     0.320
            O      0.13420   0.13420   0.59960     1.000     0.750

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  6 +/-  6 +/-  6
            MAX. ABS. INTENSITY / VOLUME**2:      22.77468898    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                17.14         28.74        5.1727    1   1   0
                21.03          8.50        4.2235    1   1   1
                24.33         16.87        3.6577    2   0   0
                27.26         56.70        3.2715    2   1   0
                29.92        100.00        2.9865    2   1   1
                34.68         10.05        2.5864    2   2   0
                36.86         21.73        2.4384    2   2   1
                36.86         22.63        2.4384    3   0   0
                38.93          2.52        2.3133    3   1   0
                40.92         33.38        2.2057    3   1   1
                42.82         26.75        2.1118    2   2   2
                44.66          8.52        2.0289    3   2   0
                46.45         30.71        1.9551    3   2   1
                49.86          8.20        1.8288    4   0   0
                51.51          7.40        1.7742    3   2   2
                51.51         24.87        1.7742    4   1   0
                53.12         10.49        1.7242    3   3   0
                53.12          7.90        1.7242    4   1   1
                54.69          1.67        1.6782    3   3   1
                56.24          6.38        1.6358    4   2   0
                57.75          9.25        1.5963    4   2   1
                59.25          9.73        1.5596    3   3   2
                62.17          4.50        1.4932    4   2   2
                63.60          2.25        1.4631    5   0   0
                65.01         10.13        1.4347    4   3   1
                65.01          3.14        1.4347    5   1   0
                66.40          2.93        1.4078    3   3   3
                66.40          5.91        1.4078    5   1   1
                69.15          2.65        1.3584    5   2   0
                69.15          6.63        1.3584    4   3   2
                70.51          6.14        1.3356    5   2   1
                73.19         26.87        1.2932    4   4   0
                74.51          2.72        1.2734    5   2   2
                75.83          1.18        1.2546    5   3   0
                77.14          1.84        1.2365    5   3   1
                78.44          1.89        1.2192    4   4   2
                79.74          1.01        1.2026    6   1   0
                81.03          6.71        1.1867    5   3   2
                81.03          1.67        1.1867    6   1   1
                83.60          1.47        1.1567    6   2   0
                84.88          5.26        1.1425    4   4   3
                84.88          3.29        1.1425    6   2   1
                86.15          2.12        1.1288    5   4   1
                87.43          2.30        1.1156    5   3   3
                88.70          2.39        1.1028    6   2   2
                89.97          2.92        1.0905    5   4   2
                89.97          2.17        1.0905    6   3   0
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.