Brenkite
      Leufer U, Tillmanns E
      Tschermaks Mineralogische und Petrographische Mitteilungen 27 (1980) 261-266
      Die kristallstruktur von brenkit, Ca2F2CO3
      _database_code_amcsd 0015679

      CELL PARAMETERS:    7.6500   7.5500   6.5480   90.000   90.000   90.000
      SPACE GROUP: Pbcn      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    378.196
      Density (g/cm3):      3.129
      MAX. ABS. INTENSITY / VOLUME**2:      7.188562196    
      RIR:      0.748
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                21.39          5.90        4.1539    1   1   1         8
                23.25          9.79        3.8250    2   0   0         2
                23.57          2.76        3.7750    0   2   0         2
                27.24         19.90        3.2740    0   0   2         2
                27.27         32.99        3.2704    0   2   1         4
                29.52         67.62        3.0259    2   1   1         8
                29.68         13.90        3.0099    1   0   2         4
                29.71         58.70        3.0072    1   2   1         8
                32.01        100.00        2.7959    1   1   2         8
                33.35          4.42        2.6868    2   2   0         4
                36.11         58.51        2.4873    2   0   2         4
                36.14          1.02        2.4857    2   2   1         8
                36.32         25.35        2.4734    0   2   2         4
                37.22         30.92        2.4159    3   1   0         4
                37.63         42.74        2.3906    1   3   0         4
                38.09         24.92        2.3624    2   1   2         8
                39.77         45.08        2.2666    3   1   1         8
                40.16         20.21        2.2456    1   3   1         8
                43.58          8.40        2.0770    2   2   2         8
                44.82         33.10        2.0222    1   1   3         8
                45.06          2.24        2.0118    3   0   2         4
                45.08         19.43        2.0110    3   2   1         8
                46.73         21.43        1.9440    3   1   2         8
                47.07         14.04        1.9307    1   3   2         8
                47.54         11.06        1.9125    4   0   0         2
                48.16         25.93        1.8896    0   2   3         4
                48.21         11.56        1.8875    0   4   0         2
                49.58         16.91        1.8387    2   1   3         8
                49.70         47.67        1.8344    1   2   3         8
                50.31          8.64        1.8137    0   4   1         4
                50.98         50.31        1.7912    3   3   0         4
                51.21         37.88        1.7838    4   1   1         8
                51.47          1.00        1.7754    3   2   2         8
                51.67          2.43        1.7691    2   3   2         8
                51.81         36.31        1.7647    1   4   1         8
                53.00          4.56        1.7277    3   3   1         8
                54.14          8.77        1.6941    2   2   3         8
                54.19          4.68        1.6926    2   4   0         4
                55.66          4.24        1.6514    4   0   2         4
                56.19          2.42        1.6370    0   0   4         2
                56.26         13.63        1.6352    0   4   2         4
                56.85          9.15        1.6196    3   1   3         8
                57.09          1.55        1.6133    4   1   2         8
                57.58          1.54        1.6008    1   0   4         4
                58.76         22.15        1.5714    3   3   2         8
                61.27          2.51        1.5130    4   2   2         8
                61.69          1.00        1.5036    2   4   2         8
                61.77          2.04        1.5019    0   2   4         4
                62.98          5.19        1.4759    2   1   4         8
                63.08          6.22        1.4737    1   2   4         8
                63.66          1.12        1.4617    5   1   1         8
                65.36          1.01        1.4277    0   4   3         4
                66.13          8.08        1.4130    4   1   3         8
                66.64          2.43        1.4035    1   4   3         8
                67.60          2.45        1.3858    5   2   1         8
                67.88          4.11        1.3807    4   3   2         8
                68.06          2.19        1.3776    3   0   4         4
                68.12          2.40        1.3765    3   4   2         8
                68.30          3.33        1.3733    2   5   1         8
                68.87          1.99        1.3633    5   1   2         8
                69.34          2.51        1.3552    3   1   4         8
                69.67          1.36        1.3497    1   5   2         8
                69.99          8.34        1.3442    4   2   3         8
                70.04          3.41        1.3434    4   4   0         4
                70.39          2.26        1.3376    2   4   3         8
                72.27          1.32        1.3074    5   3   0         4
                72.79          1.31        1.2993    3   5   0         4
                73.29          1.70        1.2916    2   3   4         8
                73.35          2.98        1.2908    2   5   2         8
                74.41          5.12        1.2750    6   0   0         2
                75.56          2.59        1.2583    0   6   0         2
                76.62          1.08        1.2436    4   0   4         4
                77.08          6.45        1.2373    0   2   5         4
                77.18          1.51        1.2359    5   1   3         8
                77.28          2.34        1.2346    6   1   1         8
                77.84          2.52        1.2271    4   1   4         8
                77.94          1.71        1.2258    1   5   3         8
                78.18          4.85        1.2226    2   1   5         8
                78.27          3.05        1.2214    1   2   5         8
                78.32          1.15        1.2208    1   4   4         8
                78.83          5.18        1.2141    5   3   2         8
                79.28          2.92        1.2084    3   3   4         8
                80.32          1.30        1.1953    2   6   0         4
                80.83          5.38        1.1891    5   2   3         8
                80.91          1.63        1.1881    6   0   2         4
                81.49          9.00        1.1811    2   5   3         8
                81.82          1.42        1.1772    2   2   5         8
                81.86          1.37        1.1767    2   4   4         8
                82.04          3.88        1.1746    0   6   2         4
                82.12          2.67        1.1736    6   1   2         8
                82.48          4.45        1.1695    5   4   1         8
                82.76          7.57        1.1662    4   5   1         8
                83.22          1.15        1.1610    1   6   2         8
                84.07          6.91        1.1513    3   1   5         8
                85.73          1.51        1.1333    6   2   2         8
                86.72          3.46        1.1228    2   6   2         8
                87.34          5.82        1.1165    3   5   3         8
                87.49          4.56        1.1149    4   3   4         8
                87.82          1.94        1.1116    2   3   5         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.