Fluor-dravite
      Grice J D, Ercit T S
      Neues Jahrbuch fur Mineralogie, Abhandlungen 165 (1993) 245-266
      Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula
      Sample: Dravite 43873
      Locality: Pierrepont, St, Lawrence Co., New York, USA
      _database_code_amcsd 0018791

      CELL PARAMETERS:   15.9990  15.9990   7.2360   90.000   90.000  120.000
      SPACE GROUP: R3m       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1604.039
      Density (g/cm3):      2.955
      MAX. ABS. INTENSITY / VOLUME**2:      6.454630588    
      RIR:      0.711
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                11.06         11.04        7.9995    1   1   0         6
                13.81          7.24        6.4140    1   0   1         3
                17.72         27.78        5.0041    0   2   1         3
                19.22         17.58        4.6185    3   0   0         3
                20.94         60.24        4.2424    2   1   1         6
                22.23         79.02        3.9997    2   2   0         6
                25.44         47.60        3.5006    0   1   2         3
                26.26         21.91        3.3939    1   3   1         6
                28.57          5.85        3.1244    4   0   1         3
                29.54         19.10        3.0235    4   1   0         6
                30.02         79.12        2.9767    1   2   2         6
                30.72          7.29        2.9103    3   2   1         6
                34.03          9.73        2.6342    3   1   2         6
                34.66        100.00        2.5878    0   5   1         3
                35.89          1.03        2.5020    0   4   2         3
                36.49          3.15        2.4622    2   4   1         6
                37.28          9.77        2.4120    0   0   3         1
                37.67         13.12        2.3880    2   3   2         6
                38.25         23.94        2.3533    5   1   1         6
                39.00          1.08        2.3093    1   1   3         6
                39.00          3.37        2.3093    6   0   0         3
                41.03          9.48        2.2000    5   0   2         3
                41.56         13.92        2.1727    4   3   1         6
                42.27          6.47        2.1380    0   3   3         3
                42.27          6.59        2.1380    3   0   3         3
                42.62         10.05        2.1212    4   2   2         6
                43.83         15.84        2.0655    2   2   3         6
                44.17         37.88        2.0503    1   5   2         6
                44.68          5.54        2.0282    1   6   1         6
                45.35          4.06        1.9999    4   4   0         6
                47.15         38.04        1.9276    3   4   2         6
                47.63          1.05        1.9092    3   5   1         6
                47.63          1.40        1.9092    7   0   1         3
                48.27          3.17        1.8855    1   4   3         6
                49.05          7.51        1.8571    6   2   1         6
                49.68          1.08        1.8352    7   1   0         6
                49.99          1.87        1.8246    6   1   2         6
                50.91          4.20        1.7938    1   0   4         3
                51.06          3.54        1.7888    3   3   3         6
                52.26          1.76        1.7503    0   2   4         3
                52.71          1.23        1.7365    0   7   2         3
                53.16          1.70        1.7230    5   4   1         6
                54.04          2.99        1.6970    2   6   2         6
                55.05         15.36        1.6680    0   6   3         3
                55.05          4.70        1.6680    6   0   3         3
                55.77         17.91        1.6482    2   7   1         6
                57.47          2.85        1.6035    4   0   4         3
                57.61         18.34        1.5999    5   5   0         6
                57.89          3.69        1.5928    4   5   2         6
                58.31          3.08        1.5824    8   1   1         6
                58.73          2.71        1.5722    3   2   4         6
                59.55          3.90        1.5523    4   6   1         6
                60.10          6.25        1.5395    9   0   0         3
                60.37          7.24        1.5332    7   2   2         6
                60.78          1.11        1.5239    7   3   1         6
                61.18         15.86        1.5148    0   5   4         3
                61.32          3.90        1.5118    8   2   0         6
                62.39          3.83        1.4883    2   4   4         6
                62.79          2.02        1.4798    1   8   2         6
                63.59         17.37        1.4632    5   1   4         6
                63.72          4.86        1.4605    1   7   3         6
                63.72          1.13        1.4605    7   1   3         6
                63.98          4.87        1.4551    6   4   2         6
                64.77          3.84        1.4394    0   1   5         3
                64.90          4.33        1.4368    7   4   0         6
                65.55          2.18        1.4241    1   9   1         6
                65.55          5.28        1.4241    6   5   1         6
                65.94         12.93        1.4166    4   3   4         6
                66.07          1.67        1.4141    3   6   3         6
                66.07          5.48        1.4141    6   3   3         6
                67.87          1.37        1.3810    3   8   1         6
                69.01         10.44        1.3608   10   0   1         3
                69.77          2.86        1.3479    5   6   2         6
                70.52          4.22        1.3353    0   4   5         3
                70.53          2.88        1.3353    3   5   4         6
                70.65          3.54        1.3333    5   5   3         6
                70.65          3.41        1.3332    6   6   0         6
                71.65          1.85        1.3171    2   3   5         6
                71.65          1.77        1.3171    6   2   4         6
                71.78         13.24        1.3151   10   1   0         6
                72.02          2.65        1.3112    8   3   2         6
                72.40          1.43        1.3053    5   7   1         6
                73.14          1.35        1.2939    0  10   2         3
                73.51          2.40        1.2883    8   4   1         6
                73.88         11.45        1.2828    5   0   5         3
                74.00          2.73        1.2810    2   8   3         6
                74.00          5.17        1.2809    9   3   0         6
                74.98          5.03        1.2666    5   4   4         6
                76.08          1.51        1.2510    1   5   5         6
                76.45          1.36        1.2459    7   5   2         6
                76.81          4.75        1.2409    0  11   1         3
                77.54          2.37        1.2311    4   8   2         6
                77.90          1.37        1.2263    2  10   1         6
                78.27          2.60        1.2215    3   4   5         6
                79.47          1.96        1.2060    0   0   6         1
                80.43          1.03        1.1940    4   6   4         6
                81.15          2.91        1.1852   11   1   1         6
                82.70          1.35        1.1669    3   0   6         3
                83.78          5.29        1.1546   10   1   3         6
                85.79          1.80        1.1326    6   5   4         6
                85.91          2.73        1.1313    9   3   3         6
                88.99          1.25        1.1000    7   2   5         6
                88.99          2.33        1.1000   10   0   4         3
                89.11          1.60        1.0988    3   3   6         6
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.