Armbrusterite
      Yakovenchuk V N, Krivovichev S K, Pakhomovsky Y A, Ivanyuk G Y, Selivanova E A,
      Menshikov Y P, Britvin S N
      American Mineralogist 92 (2007) 416-423
      Armbrusterite, K5Na6Mn3+Mn2+14[Si9O22]4(OH)10*4H2O, a new Mn hydrous
      heterophyllosilicate from the Khibiny alkaline massif, Kola Peninsula, Russia
      Locality: Khibiny alkaline massif, Kola Peninsula, Russia
      _database_code_amcsd 0004282

      CELL PARAMETERS:   17.3330  23.5390  13.4895   90.000  115.069   90.000
      SPACE GROUP: C2/m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   4985.274
      Density (g/cm3):      2.570
      MAX. ABS. INTENSITY / VOLUME**2:      37.13145460    
      RIR:      4.705
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 7.23        100.00       12.2188    0   0   1         2
                 7.98          1.52       11.0822   -1   1   1         4
                11.27          1.88        7.8501    2   0   0         2
                15.79          1.41        5.6112    2   0   1         2
                16.72          2.02        5.3019    0   4   1         4
                17.36          2.77        5.1087    3   1   0         4
                19.08          2.09        4.6524   -3   3   1         4
                20.45          8.39        4.3420   -3   3   2         4
                20.63          1.25        4.3058   -4   0   1         2
                20.68          2.03        4.2943   -2   4   2         4
                20.96          1.99        4.2383    0   4   2         4
                21.82          2.42        4.0729    0   0   3         2
                21.98          3.09        4.0437   -4   2   1         4
                22.67          1.69        3.9232    0   6   0         2
                23.82          1.08        3.7353    0   6   1         4
                25.04          1.04        3.5564   -2   6   1         4
                25.09          2.48        3.5490    1   1   3         4
                25.09          1.58        3.5488   -4   2   3         4
                26.79          1.02        3.3274   -2   6   2         4
                27.01          1.40        3.3011    0   6   2         4
                27.54          3.40        3.2383   -1   1   4         4
                27.71          1.63        3.2192    4   2   1         4
                27.75          1.02        3.2152    2   6   1         4
                28.65          1.14        3.1157    2   0   3         2
                29.24          6.52        3.0547    0   0   4         2
                30.96          1.34        2.8888   -6   0   2         2
                31.25          1.09        2.8624   -5   1   4         4
                31.63          9.67        2.8290    3   7   0         4
                31.72          1.03        2.8210    2   6   2         4
                31.87          2.15        2.8081   -6   0   3         2
                34.13          9.35        2.6271    3   7   1         4
                34.20          1.44        2.6219   -3   7   3         4
                34.41          4.75        2.6065   -6   0   4         2
                37.99          4.40        2.3686    3   7   2         4
                38.08          1.39        2.3629   -3   7   4         4
                38.29          2.56        2.3507   -6   0   5         2
                42.90          1.33        2.1083    3   7   3         4
                54.58          1.25        1.6814    0  14   0         2
                54.94          1.74        1.6712   -9   7   3         4
                55.14          1.11        1.6657    0  14   1         4
                55.46          1.21        1.6568   -9   7   2         4
                55.53          1.12        1.6548   -9   7   4         4
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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.