Gaudefroyite
      Antao S M, Hassan I
      The Canadian Mineralogist 46 (2008) 183-193
      Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure
      Locality: Wessels mine, Kalahari manganese field, South Africa
      Sample: T = 350 C
      _database_code_amcsd 0006175

      CELL PARAMETERS:   10.6545  10.6545   5.9170   90.000   90.000  120.000
      SPACE GROUP: P6_3/m    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    581.700
      Density (g/cm3):      3.480
      MAX. ABS. INTENSITY / VOLUME**2:      16.21010434    
      RIR:      1.517
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 9.59         42.53        9.2271    1   0   0         6
                16.64          9.05        5.3272    1   1   0         6
                17.81         16.37        4.9809    1   0   1        12
                19.24         72.11        4.6135    2   0   0         6
                22.46          2.64        3.9591    1   1   1        12
                24.47          5.04        3.6383    2   0   1        12
                25.54          2.25        3.4875    1   2   0         6
                29.03         11.22        3.0757    3   0   0         6
                29.74         32.77        3.0045    1   2   1        12
                29.74          7.48        3.0045    2   1   1        12
                31.76          2.81        2.8172    1   0   2        12
                32.82         18.73        2.7290    3   0   1        12
                33.65         64.37        2.6636    2   2   0         6
                35.06          5.69        2.5591    1   3   0         6
                35.06          4.07        2.5591    3   1   0         6
                36.06        100.00        2.4904    2   0   2        12
                37.01          3.55        2.4289    2   2   1        12
                38.32         11.04        2.3489    1   3   1        12
                38.32          3.64        2.3489    3   1   1        12
                39.05          4.65        2.3068    4   0   0         6
                39.96         10.05        2.2561    1   2   2        12
                39.96          4.38        2.2561    2   1   2        12
                42.04          7.22        2.1492    4   0   1        12
                42.39          6.56        2.1322    3   0   2        12
                42.71          4.93        2.1168    2   3   0         6
                42.71          4.15        2.1168    3   2   0         6
                45.51          3.55        1.9931    2   3   1        12
                46.94         10.84        1.9355    3   1   2        12
                47.12          5.19        1.9288    1   0   3        12
                47.71          5.15        1.9062    1   4   1        12
                47.71          1.24        1.9062    4   1   1        12
                49.26          1.29        1.8496    1   1   3        12
                49.39          7.92        1.8454    5   0   0         6
                50.15         39.03        1.8191    4   0   2        12
                50.31          1.93        1.8136    2   0   3        12
                51.90          6.70        1.7617    5   0   1        12
                52.48          1.26        1.7437    2   4   0         6
                52.48          6.58        1.7437    4   2   0         6
                53.21          2.21        1.7215    2   3   2        12
                53.21          7.59        1.7215    3   2   2        12
                53.36          2.48        1.7168    1   2   3        12
                53.36          1.47        1.7168    2   1   3        12
                54.89          1.95        1.6726    4   2   1        12
                55.18          1.36        1.6646    1   4   2        12
                55.18          3.60        1.6646    4   1   2        12
                55.33          2.73        1.6603    3   0   3        12
                55.44          1.82        1.6572    1   5   0         6
                55.44          3.94        1.6572    5   1   0         6
                57.77          4.55        1.5958    5   1   1        12
                60.17         12.81        1.5378    6   0   0         6
                60.84          2.72        1.5225    3   3   2        12
                61.09          1.01        1.5169    3   4   0         6
                61.09          1.83        1.5169    4   3   0         6
                61.75         13.80        1.5022    2   4   2        12
                61.75         18.08        1.5022    4   2   2        12
                62.82          8.44        1.4793    0   0   4         2
                62.90          1.11        1.4775    5   2   0         6
                63.29          1.60        1.4694    3   4   1        12
                63.71          1.21        1.4606    1   0   4        12
                64.44          1.97        1.4458    1   5   2        12
                64.58          1.08        1.4430    2   3   3        12
                65.49          1.04        1.4253    1   1   4        12
                66.36          2.50        1.4086    2   0   4        12
                68.80          3.56        1.3645    6   0   2        12
                69.79          2.08        1.3475    5   0   3        12
                70.74          6.53        1.3318    4   4   0         6
                73.19         11.19        1.2932    2   2   4        12
                74.10          1.56        1.2796    2   6   0         6
                74.10          1.71        1.2796    6   2   0         6
                74.70          3.49        1.2707    1   6   2        12
                74.83          1.18        1.2688    1   5   3        12
                74.83          2.33        1.2688    5   1   3        12
                76.50          1.49        1.2452    4   0   4        12
                79.75          1.04        1.2024    3   4   3        12
                82.06          2.81        1.1744    2   6   2        12
                82.06          5.17        1.1744    6   2   2        12
                83.81          1.27        1.1542    5   0   4        12
                86.08          1.32        1.1296    1   7   2        12
                86.22          1.68        1.1280    4   2   4        12
                88.62          1.16        1.1036    5   1   4        12
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.