Spinel
      Redfern S A T, Harrison R J, O'Neill H St C, Wood D R R
      American Mineralogist 84 (1999) 299-310
      Thermodynamics and kinetics of cation ordering in MgAl2O4 spinel up to 1600 C
      from in situ neutron diffraction
      Data collected at IPNS, Argonne National Laboratory,
      T = 1376 K on heating cycle, Mg.99Al2O4
      _database_code_amcsd 0002175

      CELL PARAMETERS:    8.1678   8.1678   8.1678   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    544.888
      Density (g/cm3):      3.468
      MAX. ABS. INTENSITY / VOLUME**2:      17.30032814    
      RIR:      1.624
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.82         28.42        4.7157    1   1   1         8
                30.97         32.29        2.8877    2   2   0        12
                36.49        100.00        2.4627    3   1   1        24
                38.17          1.19        2.3578    2   2   2         8
                44.36         54.99        2.0419    4   0   0         6
                55.08          8.49        1.6672    4   2   2        24
                58.74          3.28        1.5719    3   3   3         8
                58.74         36.21        1.5719    5   1   1        24
                64.54         62.85        1.4439    4   4   0        12
                67.89          2.60        1.3806    5   3   1        48
                73.30          2.48        1.2914    6   2   0        24
                76.48          8.11        1.2456    5   3   3        24
                81.68          5.51        1.1789    4   4   4         8
                84.76          1.87        1.1437    5   5   1        24
                89.87          3.42        1.0915    6   4   2        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.