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 = 770 K on cooling cycle, MgAl2O4
      _database_code_amcsd 0002138

      CELL PARAMETERS:    8.1147   8.1147   8.1147   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    534.336
      Density (g/cm3):      3.536
      MAX. ABS. INTENSITY / VOLUME**2:      18.19575594    
      RIR:      1.675
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.94         32.64        4.6850    1   1   1         8
                31.17         33.14        2.8690    2   2   0        12
                36.73        100.00        2.4467    3   1   1        24
                38.43          1.21        2.3425    2   2   2         8
                44.67         56.79        2.0287    4   0   0         6
                55.47          9.00        1.6564    4   2   2        24
                59.16          3.04        1.5617    3   3   3         8
                59.16         41.88        1.5617    5   1   1        24
                65.02         69.61        1.4345    4   4   0        12
                68.39          3.09        1.3716    5   3   1        48
                73.86          2.71        1.2830    6   2   0        24
                77.07          9.46        1.2375    5   3   3        24
                82.33          6.44        1.1713    4   4   4         8
                85.45          2.62        1.1363    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.