Columbite-(Fe)
      Tarantino S C, Zema M
      American Mineralogist 90 (2005) 1291-1300
      Mixing and ordering behavior in manganocolumbite-ferrocolumbite solid solution:
      A single-crystal X-ray diffraction study
      Sample: BRA n18 Qm=0.759 from S. Jose de Safira, Minas Gerais, Brazil
      Sample: Annealed at T = 700 C for t = 20 m
      Note: Occupancies calculated assuming complete Fe/Mn disorder
      _database_code_amcsd 0003856

      CELL PARAMETERS:   14.2658   5.7299   5.0748   90.000   90.000   90.000
      SPACE GROUP: Pbcn      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    414.822
      Density (g/cm3):      5.544
      MAX. ABS. INTENSITY / VOLUME**2:      125.9725436    
      RIR:      7.398
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.41          2.81        7.1329    2   0   0         2
                24.24          4.78        3.6711    1   1   1         8
                24.32         26.96        3.6593    3   1   0         4
                24.97          2.44        3.5665    4   0   0         2
                30.11        100.00        2.9681    3   1   1         8
                31.22          9.00        2.8649    0   2   0         2
                35.37         13.49        2.5374    0   0   2         2
                36.00         14.72        2.4948    0   2   1         4
                37.84          6.82        2.3776    6   0   0         2
                40.29          2.80        2.2386    3   0   2         4
                40.85          5.26        2.2092    3   2   1         8
                43.40          8.19        2.0851    3   1   2         8
                47.89          6.57        1.8995    0   2   2         4
                49.84          5.97        1.8296    6   2   0         4
                50.84          1.24        1.7959    7   1   1         8
                51.57         13.27        1.7723    3   3   0         4
                52.76         16.19        1.7350    6   0   2         4
                53.22         21.29        1.7212    6   2   1         8
                60.27         13.38        1.5355    3   1   3         8
                62.59          4.67        1.4841    6   2   2         8
                63.61         11.01        1.4629    9   1   1         8
                63.91          7.72        1.4566    0   2   3         4
                64.09         12.13        1.4530    3   3   2         8
                68.00          5.26        1.3786    0   4   1         4
                72.18          2.04        1.3088    9   1   2         8
                74.84          1.49        1.2687    0   0   4         2
                76.73          2.12        1.2421    6   2   3         8
                78.40          2.84        1.2198    9   3   0         4
                80.05          1.22        1.1987    3   1   4         8
                80.54          5.43        1.1926    6   4   1         8
                80.85          2.20        1.1888   12   0   0         2
                83.30          1.10        1.1600    0   2   4         4
                85.68          3.61        1.1338    9   1   3         8
                87.06          3.20        1.1193    6   0   4         4
                87.57          1.29        1.1141    3   5   0         4
                89.06          4.86        1.0993    9   3   2         8
                89.69          1.99        1.0932    0   4   3         4
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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.