Londonite
      Gatta G D, Vignola P, McIntyre G J, Diella V
      American Mineralogist 95 (2010) 1467-1472
      On the crystal chemistry of londonite [(Cs,K,Rb)Al4Be5B11O28]:
      a single-crystal neutron diffraction study at 300 and 20 K
      Locality: Antsongombato Gem mine, Betafo district, Madagascar
      Note: neutron diffraction study at T = 300 K
      _database_code_amcsd 0017717

      CELL PARAMETERS:    7.3098   7.3098   7.3098   90.000   90.000   90.000
      SPACE GROUP: P-43m     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    390.586
      Density (g/cm3):      3.368
      MAX. ABS. INTENSITY / VOLUME**2:      12.96736951    
      RIR:      1.254
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.11         29.99        7.3098    1   0   0         6
                17.16          5.27        5.1688    1   1   0        12
                24.35          8.59        3.6549    2   0   0         6
                27.28         33.61        3.2690    2   1   0        24
                29.94        100.00        2.9842    2   1   1        12
                34.71          4.42        2.5844    2   2   0        12
                36.89         12.73        2.4366    2   2   1        12
                36.89         25.35        2.4366    3   0   0         6
                40.95         29.38        2.2040    3   1   1        12
                42.86         48.46        2.1102    2   2   2         4
                44.70          2.95        2.0274    3   2   0        24
                46.48         28.44        1.9536    3   2   1        24
                49.90         22.91        1.8275    4   0   0         6
                51.55          4.08        1.7729    3   2   2        12
                51.55         24.22        1.7729    4   1   0        24
                53.16          9.97        1.7229    3   3   0        12
                53.16          6.97        1.7229    4   1   1        12
                56.28          3.52        1.6345    4   2   0        24
                57.80          4.97        1.5951    4   2   1        24
                59.30          8.69        1.5585    3   3   2        12
                62.22          2.92        1.4921    4   2   2        12
                63.65          1.86        1.4620    5   0   0         6
                63.65          1.58        1.4620    4   3   0        24
                65.06          8.99        1.4336    4   3   1        24
                65.06          1.11        1.4336    5   1   0        24
                66.46          5.45        1.4068    5   1   1        12
                66.46          2.71        1.4068    3   3   3         4
                69.21          1.31        1.3574    5   2   0        24
                69.21          3.44        1.3574    4   3   2        24
                70.57          4.10        1.3346    5   2   1        24
                73.25         41.46        1.2922    4   4   0        12
                74.58          2.04        1.2725    5   2   2        12
                75.90          1.98        1.2536    4   3   3        12
                81.10          5.90        1.1858    5   3   2        24
                81.10          1.69        1.1858    6   1   1        12
                84.95          5.28        1.1416    4   4   3        12
                84.95          1.91        1.1416    6   2   1        24
                86.23          2.54        1.1279    5   4   1        24
                87.51          1.76        1.1147    5   3   3        12
                88.78          4.75        1.1020    6   2   2        12
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.