Brownmillerite
      Redhammer G J, Tippelt G, Roth G, Amthauer G
      American Mineralogist 89 (2004) 405-420
      Structural variations in the brownmillerite series Ca2(Fe2-xAlx)O5:
      Single-crystal X-ray diffraction at 25 deg C and high temperature
      X-ray powder diffraction (25 C <= T <= 1000 C)
      Sample: bht50_2
      Locality: synthetic
      _database_code_amcsd 0003434

      CELL PARAMETERS:    5.3832  14.6214   5.5916   90.000   90.000   90.000
      SPACE GROUP: I2mb      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    440.114
      Density (g/cm3):      3.845
      MAX. ABS. INTENSITY / VOLUME**2:      30.26808102    
      RIR:      2.563
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.11         22.97        7.3107    0   2   0         2
                16.98          3.51        5.2227    0   1   1         4
                22.93          8.61        3.8781    1   0   1         2
                24.22         11.69        3.6740    0   3   1         4
                24.35          5.44        3.6553    0   4   0         2
                26.01          4.04        3.4259    1   2   1         4
                32.01         34.51        2.7958    0   0   2         2
                33.29         43.59        2.6916    2   0   0         1
                33.69        100.00        2.6600    1   4   1         4
                34.62          9.87        2.5913    0   5   1         4
                36.74          4.02        2.4462    1   1   2         4
                40.63          2.21        2.2207    0   4   2         4
                40.81          1.07        2.2111    1   3   2         4
                41.59          5.64        2.1713    2   3   1         4
                41.67          2.08        2.1674    2   4   0         2
                43.88         19.95        2.0633    1   6   1         4
                46.85         41.83        1.9390    2   0   2         2
                48.09          3.03        1.8919    1   5   2         4
                48.58          9.69        1.8742    2   2   2         4
                49.90         17.90        1.8277    0   8   0         2
                50.52          1.80        1.8065    2   6   0         2
                52.57          7.88        1.7409    0   3   3         4
                55.21          2.12        1.6637    3   2   1         4
                55.59          2.99        1.6533    1   8   1         4
                57.69          2.83        1.5979    1   7   2         4
                58.14         16.98        1.5867    1   4   3         4
                58.74          2.72        1.5718    0   5   3         4
                59.74         19.70        1.5478    3   4   1         4
                60.52          6.42        1.5298    0   8   2         4
                61.31          8.40        1.5120    2   8   0         2
                61.76          2.62        1.5021    3   1   2         4
                63.66          4.32        1.4618    2   3   3         4
                65.38          4.27        1.4275    1   6   3         4
                66.88          5.13        1.3990    3   6   1         4
                66.94          2.06        1.3979    0   0   4         2
                68.32          3.72        1.3730    0   2   4         4
                68.59          2.66        1.3681    1  10   1         4
                69.22          3.63        1.3573    2   5   3         4
                69.81          1.83        1.3473    1   1   4         4
                69.90          4.56        1.3458    4   0   0         1
                70.14          1.20        1.3418    3   5   2         4
                70.85         12.41        1.3300    2   8   2         4
                71.25          2.07        1.3236    4   2   0         2
                76.29          1.04        1.2481    3   8   1         4
                76.84          1.20        1.2406    2   0   4         2
                77.78          1.13        1.2280    1   5   4         4
                78.09          1.71        1.2238    3   7   2         4
                78.15          1.06        1.2231    2   2   4         4
                78.48          4.74        1.2187    3   4   3         4
                78.95          3.03        1.2126    4   0   2         2
                82.65          2.92        1.1674    2  10   2         4
                83.09          3.56        1.1624    1  12   1         4
                84.92          2.60        1.1420    3   6   3         4
                85.51          2.52        1.1356    1   7   4         4
                87.89          1.41        1.1109    3  10   1         4
                87.94          1.08        1.1104    0   8   4         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.