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: bht140_2
      Locality: synthetic
      _database_code_amcsd 0003442

      CELL PARAMETERS:    5.2991  14.4434   5.5099   90.000   90.000   90.000
      SPACE GROUP: I2mb      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    421.711
      Density (g/cm3):      3.669
      MAX. ABS. INTENSITY / VOLUME**2:      21.83784629    
      RIR:      1.938
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.26         40.17        7.2217    0   2   0         2
                17.22          2.57        5.1480    0   1   1         4
                23.29          2.10        3.8194    1   0   1         2
                24.55         13.43        3.6254    0   3   1         4
                24.66          1.43        3.6109    0   4   0         2
                26.40          3.58        3.3763    1   2   1         4
                32.50         36.53        2.7550    0   0   2         2
                33.83         46.70        2.6495    2   0   0         1
                34.17        100.00        2.6239    1   4   1         4
                35.07         11.05        2.5584    0   5   1         4
                37.31          3.32        2.4101    1   1   2         4
                41.22          8.21        2.1903    0   4   2         4
                41.43          1.02        2.1795    1   3   2         4
                42.25          5.62        2.1392    2   3   1         4
                42.31          7.50        2.1362    2   4   0         2
                44.49         28.76        2.0365    1   6   1         4
                47.62         48.66        1.9097    2   0   2         2
                48.81          2.37        1.8660    1   5   2         4
                49.36         12.12        1.8462    2   2   2         4
                50.34          1.01        1.8127    0   6   2         4
                50.55         19.73        1.8054    0   8   0         2
                51.28          1.70        1.7817    2   6   0         2
                53.39          7.66        1.7160    0   3   3         4
                56.15          1.38        1.6382    3   2   1         4
                56.37          1.19        1.6323    1   8   1         4
                58.54          2.77        1.5767    1   7   2         4
                59.06         17.72        1.5641    1   4   3         4
                59.66          2.48        1.5499    0   5   3         4
                60.74         19.75        1.5247    3   4   1         4
                61.40          5.94        1.5101    0   8   2         4
                62.22          7.90        1.4920    2   8   0         2
                62.82          2.27        1.4792    3   1   2         4
                64.72          4.12        1.4403    2   3   3         4
                66.41          5.20        1.4077    1   6   3         4
                67.99          5.85        1.3788    3   6   1         4
                68.06          2.47        1.3775    0   0   4         2
                69.47          4.03        1.3531    0   2   4         4
                69.59          3.33        1.3510    1  10   1         4
                70.37          3.45        1.3378    2   5   3         4
                71.00          1.48        1.3275    1   1   4         4
                71.17          5.15        1.3248    4   0   0         1
                71.34          1.11        1.3221    3   5   2         4
                71.98         13.41        1.3119    2   8   2         4
                72.55          2.23        1.3030    4   2   0         2
                74.12          1.04        1.2792    0  10   2         4
                78.21          1.35        1.2222    2   0   4         2
                79.44          1.74        1.2064    3   7   2         4
                79.89          4.55        1.2007    3   4   3         4
                80.44          3.34        1.1939    4   0   2         2
                84.01          3.65        1.1520    2  10   2         4
                84.37          3.29        1.1480    1  12   1         4
                86.47          3.16        1.1254    3   6   3         4
                87.02          2.58        1.1198    1   7   4         4
                89.42          1.70        1.0958    3  10   1         4
                89.49          1.24        1.0951    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.