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 = 1171 K on cooling cycle, Mg.99Al2O4
      _database_code_amcsd 0002189

      CELL PARAMETERS:    8.1522   8.1522   8.1522   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    541.786
      Density (g/cm3):      3.488
      MAX. ABS. INTENSITY / VOLUME**2:      17.64155580    
      RIR:      1.647
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.85         29.42        4.7067    1   1   1         8
                31.03         32.56        2.8822    2   2   0        12
                36.56        100.00        2.4580    3   1   1        24
                38.24          1.21        2.3533    2   2   2         8
                44.45         55.40        2.0381    4   0   0         6
                55.20          8.75        1.6641    4   2   2        24
                58.86          3.24        1.5689    3   3   3         8
                58.86         38.01        1.5689    5   1   1        24
                64.68         65.22        1.4411    4   4   0        12
                68.04          2.69        1.3780    5   3   1        48
                73.47          2.61        1.2890    6   2   0        24
                76.65          8.59        1.2432    5   3   3        24
                81.86          5.78        1.1767    4   4   4         8
                84.96          2.05        1.1415    5   5   1        24
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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.