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 = 20 K
      _database_code_amcsd 0017718

      CELL PARAMETERS:    7.3094   7.3094   7.3094   90.000   90.000   90.000
      SPACE GROUP: P-43m     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    390.522
      Density (g/cm3):      3.369
      MAX. ABS. INTENSITY / VOLUME**2:      13.20732270    
      RIR:      1.277
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.11         28.87        7.3094    1   0   0         6
                17.16          5.26        5.1685    1   1   0        12
                24.35          8.68        3.6547    2   0   0         6
                27.28         34.96        3.2689    2   1   0        24
                29.94        100.00        2.9841    2   1   1        12
                34.71          4.85        2.5843    2   2   0        12
                36.89         13.34        2.4365    2   2   1        12
                36.89         25.87        2.4365    3   0   0         6
                40.95         30.47        2.2039    3   1   1        12
                42.86         48.68        2.1100    2   2   2         4
                44.70          3.34        2.0273    3   2   0        24
                46.49         29.72        1.9535    3   2   1        24
                49.91         22.30        1.8274    4   0   0         6
                51.55          4.67        1.7728    3   2   2        12
                51.55         25.39        1.7728    4   1   0        24
                53.16         10.54        1.7228    3   3   0        12
                53.16          7.31        1.7228    4   1   1        12
                56.29          4.08        1.6344    4   2   0        24
                57.81          5.76        1.5950    4   2   1        24
                59.30          9.31        1.5584    3   3   2        12
                62.22          3.38        1.4920    4   2   2        12
                63.65          2.02        1.4619    5   0   0         6
                63.65          1.25        1.4619    4   3   0        24
                65.07          9.75        1.4335    4   3   1        24
                65.07          1.54        1.4335    5   1   0        24
                66.46          3.04        1.4067    3   3   3         4
                66.46          5.97        1.4067    5   1   1        12
                69.22          1.66        1.3573    5   2   0        24
                69.22          4.27        1.3573    4   3   2        24
                70.58          4.89        1.3345    5   2   1        24
                73.26         43.63        1.2921    4   4   0        12
                74.58          2.30        1.2724    5   2   2        12
                75.90          1.67        1.2536    4   3   3        12
                78.52          1.15        1.2182    4   4   2        12
                81.11          6.82        1.1857    5   3   2        24
                81.11          1.87        1.1857    6   1   1        12
                84.96          6.05        1.1415    4   4   3        12
                84.96          2.42        1.1415    6   2   1        24
                86.24          2.70        1.1279    5   4   1        24
                87.52          2.14        1.1147    5   3   3        12
                88.79          5.00        1.1019    6   2   2        12
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.