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=0.898 from S. Jose de Safira, Minas Gerais, Brazil
      Sample: Annealed at T = 800 C for t = 7 m
      Note: Occupancies calculated assuming complete Fe/Mn disorder
      _database_code_amcsd 0003857

      CELL PARAMETERS:   14.2733   5.7317   5.0646   90.000   90.000   90.000
      SPACE GROUP: Pbcn      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    414.336
      Density (g/cm3):      5.550
      MAX. ABS. INTENSITY / VOLUME**2:      127.0607543    
      RIR:      7.454
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.40          3.76        7.1367    2   0   0         2
                16.67          1.08        5.3189    1   1   0         4
                24.27          6.30        3.6678    1   1   1         8
                24.31         26.33        3.6609    3   1   0         4
                24.95          3.22        3.5683    4   0   0         2
                30.12        100.00        2.9669    3   1   1         8
                31.21          9.21        2.8658    0   2   0         2
                35.45         13.44        2.5323    0   0   2         2
                36.01         14.32        2.4942    0   2   1         4
                37.82          6.78        2.3789    6   0   0         2
                40.35          2.79        2.2354    3   0   2         4
                40.85          5.22        2.2091    3   2   1         8
                43.45          7.93        2.0826    3   1   2         8
                47.94          6.75        1.8976    0   2   2         4
                49.82          6.14        1.8304    6   2   0         4
                50.83          1.65        1.7962    7   1   1         8
                51.55         13.19        1.7730    3   3   0         4
                52.80         16.06        1.7338    6   0   2         4
                53.21         20.96        1.7215    6   2   1         8
                54.86          1.02        1.6734    3   3   1         8
                60.38         13.42        1.5330    3   1   3         8
                62.62          4.80        1.4835    6   2   2         8
                63.58         11.01        1.4633    9   1   1         8
                64.01          7.61        1.4546    0   2   3         4
                64.12         12.08        1.4524    3   3   2         8
                67.99          5.36        1.3788    0   4   1         4
                72.19          2.00        1.3086    9   1   2         8
                75.02          1.50        1.2661    0   0   4         2
                76.81          2.07        1.2410    6   2   3         8
                78.36          2.82        1.2203    9   3   0         4
                80.22          1.20        1.1966    3   1   4         8
                80.52          5.52        1.1929    6   4   1         8
                80.80          2.18        1.1894   12   0   0         2
                83.46          1.15        1.1582    0   2   4         4
                85.75          3.63        1.1331    9   1   3         8
                87.22          3.23        1.1177    6   0   4         4
                87.54          1.38        1.1144    3   5   0         4
                89.06          4.83        1.0993    9   3   2         8
                89.77          2.04        1.0925    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.