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 = 834 K on cooling cycle, MgAl2O4
      _database_code_amcsd 0002137

      CELL PARAMETERS:    8.1193   8.1193   8.1193   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    535.245
      Density (g/cm3):      3.530
      MAX. ABS. INTENSITY / VOLUME**2:      18.07404496    
      RIR:      1.667
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.93         32.88        4.6877    1   1   1         8
                31.16         33.13        2.8706    2   2   0        12
                36.71        100.00        2.4481    3   1   1        24
                38.41          1.20        2.3438    2   2   2         8
                44.64         56.96        2.0298    4   0   0         6
                55.44          8.88        1.6573    4   2   2        24
                59.12          3.01        1.5626    3   3   3         8
                59.12         41.68        1.5626    5   1   1        24
                64.97         69.16        1.4353    4   4   0        12
                68.35          3.16        1.3724    5   3   1        48
                73.81          2.63        1.2838    6   2   0        24
                77.02          9.34        1.2382    5   3   3        24
                82.27          6.44        1.1719    4   4   4         8
                85.39          2.65        1.1369    5   5   1        24
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.