Britvinite
      Yakubovich O V, Massa W, Chukanov N V
      Crystallography Reports 53 (2008) 206-215
      Crystal structure of britvinite [Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]:
      A new layered silicate with an original type of silicon-oxygen networks
      Locality: Varmland, Sweden
      _database_code_amcsd 0012396

      CELL PARAMETERS:    9.3409   9.3579  18.8333   80.365   75.816   59.870
      SPACE GROUP: P-1       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1378.475
      Density (g/cm3):      5.387
      MAX. ABS. INTENSITY / VOLUME**2:      148.9439548    
      RIR:      9.003
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 4.85        100.00       18.2336    0   0   1         2
                 9.70          4.91        9.1168    0   0   2         2
                11.15          1.93        7.9335    1   0   0         2
                12.21          1.97        7.2481    0  -1   1         2
                13.28          1.05        6.6679   -1  -1   1         2
                14.57          2.50        6.0779    0   0   3         2
                16.16          1.32        5.4850    1   1   3         2
                16.55          1.02        5.3571   -1  -1   2         2
                17.79          1.42        4.9860    0   1   3         2
                19.08          1.72        4.6505   -1   1   0         2
                19.25          2.10        4.6107    1   2   0         2
                19.47          2.06        4.5584    0   0   4         2
                19.61          1.49        4.5279    2   1   0         2
                19.64          3.27        4.5208    2   1   2         2
                20.05          3.42        4.4291    1   2   2         2
                20.08          4.28        4.4220   -1   1   1         2
                20.56          1.18        4.3205    1   0   4         2
                20.66          2.01        4.2996   -1  -2   1         2
                20.73          3.66        4.2841    1  -1   2         2
                21.35          5.79        4.1622   -2  -1   1         2
                21.40          1.41        4.1513    2   1   3         2
                22.13          4.99        4.0171    1   2   3         2
                22.14          1.37        4.0143   -1   1   2         2
                22.41          1.01        3.9667    2   0   0         2
                23.61          1.64        3.7691    0   2   2         2
                23.83          1.99        3.7342    2   2   3         2
                23.84          1.04        3.7324   -2   0   1         2
                24.07          1.21        3.6975    2   1   4         2
                24.26          2.42        3.6690   -2  -2   1         2
                24.29          3.50        3.6648   -1   0   4         2
                24.56          1.39        3.6241    0  -2   2         2
                25.02          1.62        3.5584    1   2   4         2
                25.03          3.53        3.5581   -1   1   3         2
                26.17          3.49        3.4050   -1  -2   3         2
                26.25          6.84        3.3943    1  -1   4         2
                26.27          1.88        3.3920    0   1   5         2
                26.86          1.35        3.3188    2   0   4         2
                27.14          1.64        3.2859    0  -2   3         2
                27.29          8.79        3.2674   -2  -1   3         2
                27.36          5.02        3.2600    0  -1   5         2
                27.38          5.26        3.2569    2   1   5         2
                28.50          6.10        3.1321   -1   1   4         2
                28.51          9.64        3.1311    1   2   5         2
                28.86          1.19        3.0940    1   1   6         2
                29.30          2.46        3.0481    3   1   1         2
                29.35          2.06        3.0430   -1  -1   5         2
                29.42          2.84        3.0358    1   0   6         2
                29.43          3.58        3.0353    1   3   0         2
                29.48          2.65        3.0297   -2   1   0         2
                29.50          1.88        3.0283    1  -2   1         2
                29.78          1.72        3.0004    2   3   0         2
                29.81          2.40        2.9967   -1  -2   4         2
                29.90          2.38        2.9885    2  -1   2         2
                29.90          5.78        2.9885    1  -1   5         2
                30.06          1.03        2.9725    3   1   0         2
                30.07          2.15        2.9717    3   2   3         2
                30.17          2.18        2.9621    3   2   0         2
                30.26          1.84        2.9541    3   1   3         2
                30.45          2.51        2.9358    2   3   3         2
                30.49          2.65        2.9321   -1  -3   1         2
                30.56          4.15        2.9249    1  -2   2         2
                31.07          2.07        2.8788   -2  -1   4         2
                31.15          1.26        2.8711    1   3   3         2
                31.17          3.63        2.8693   -2  -3   1         2
                31.19          2.15        2.8678   -1   2   2         2
                31.64          2.51        2.8281    3   2   4         2
                31.80          2.75        2.8144   -3  -2   1         2
                32.01          2.54        2.7962    0  -1   6         2
                32.24          1.47        2.7767    2   3   4         2
                32.27          1.54        2.7737   -2   1   2         2
                33.21          2.48        2.6973    3   3   2         2
                33.23          1.79        2.6958    1   3   4         2
                33.26          3.12        2.6941    0   3   0         2
                33.26          2.51        2.6938   -1   2   3         2
                33.30          3.69        2.6903    3   0   1         2
                33.33          1.93        2.6879    3   3   1         2
                33.36          2.98        2.6858    0   3   1         2
                33.45          3.05        2.6788    3   0   2         2
                33.56          2.57        2.6704    1   1   7         2
                34.07          2.54        2.6315   -1  -1   6         2
                34.22          2.46        2.6206    3   1   5         2
                34.73          1.22        2.5828   -1  -3   3         2
                35.65          1.17        2.5184    0   1   7         2
                36.69          1.12        2.4497    3   2   6         2
                37.64          1.22        2.3899   -2   1   4         2
                37.88          1.39        2.3750    0   3   4         2
                37.90          1.54        2.3742   -3  -3   2         2
                39.54          2.74        2.2792    0   0   8         2
                40.41          2.27        2.2323    2  -2   3         2
                40.74          2.28        2.2146    2   4   4         2
                41.12          1.03        2.1949   -1  -3   5         2
                41.38          2.20        2.1822   -4  -2   1         2
                42.19          1.97        2.1421    2  -2   4         2
                44.28          1.24        2.0457    2   1   9         2
                44.73          1.36        2.0260    0   0   9         2
                45.72          1.53        1.9846   -1   1   8         2
                47.41          1.08        1.9177   -1  -2   8         2
                51.07          1.32        1.7885   -4   0   3         2
                51.80          1.02        1.7649    4   5   3         2
                51.84          1.31        1.7637    5   4   2         2
                51.97          1.03        1.7595    1   5   2         2
                52.55          1.06        1.7416   -4   1   0         2
                52.96          1.73        1.7290    0  -4   5         2
                55.09          1.11        1.6670   -4  -4   4         2
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.