Fluorcalciomicrolite
      Andrade M B, Atencio D, Persiano A I C, Ellena J
      Mineralogical Magazine 77 (2013) 2989-2996
      Fluorcalciomicrolite, (Ca,Na,_)2Ta2O6F, a new microlite-group mineral
      from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil
      Locality: Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil
      _database_code_amcsd 0019993

      CELL PARAMETERS:   10.4191  10.4191  10.4191   90.000   90.000   90.000
      SPACE GROUP: Fd-3m     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1131.073
      Density (g/cm3):      6.085
      MAX. ABS. INTENSITY / VOLUME**2:      227.1182520    
      RIR:     12.154
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                14.73         70.45        6.0155    1   1   1         8
                28.41         50.03        3.1415    3   1   1        24
                29.70        100.00        3.0077    2   2   2         8
                34.43         30.93        2.6048    4   0   0         6
                37.63          8.95        2.3903    3   3   1        24
                45.22          8.21        2.0052    5   1   1        24
                45.22          8.28        2.0052    3   3   3         8
                49.49         45.33        1.8419    4   4   0        12
                51.92         15.09        1.7611    5   3   1        48
                58.05          7.69        1.5889    5   3   3        24
                58.79         41.40        1.5707    6   2   2        24
                61.68         10.41        1.5039    4   4   4         8
                63.79          6.13        1.4590    5   5   1        24
                63.79          3.80        1.4590    7   1   1        24
                69.27          9.45        1.3565    7   3   1        48
                69.27          3.01        1.3565    5   5   3        24
                72.59          6.31        1.3024    8   0   0         6
                74.55          1.33        1.2729    7   3   3        24
                79.70          4.47        1.2031    7   5   1        48
                80.34         15.87        1.1952    6   6   2        24
                82.87         13.51        1.1649    8   4   0        24
                84.77          2.01        1.1436    9   1   1        24
                84.77          3.22        1.1436    7   5   3        48
                89.79          4.35        1.0922    9   3   1        48
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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.