Spinel
      Meducin F, Redfern S A T, Le Godec Y, Stone H J, Tucker M G, Dove M T, Marshall W G
      American Mineralogist 89 (2004) 981-986
      Study of cation order-disorder in MgAl2O4 spinel by in situ neutron
      diffraction up to 1600 K and 3.2 GPa
      Sample at T = 887 K and P = 1.7 GPa, inversion parameter x = .509
      _database_code_amcsd 0003577

      CELL PARAMETERS:    8.1050   8.1050   8.1050   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    532.426
      Density (g/cm3):      3.549
      MAX. ABS. INTENSITY / VOLUME**2:      17.34083025    
      RIR:      1.591
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.97         29.53        4.6794    1   1   1         8
                31.21         35.60        2.8656    2   2   0        12
                36.78        100.00        2.4437    3   1   1        24
                38.48          2.41        2.3397    2   2   2         8
                44.73         55.73        2.0262    4   0   0         6
                55.55          9.49        1.6544    4   2   2        24
                59.24          2.60        1.5598    3   3   3         8
                59.24         39.74        1.5598    5   1   1        24
                65.10         66.81        1.4328    4   4   0        12
                68.49          1.86        1.3700    5   3   1        48
                73.96          2.84        1.2815    6   2   0        24
                77.18          8.03        1.2360    5   3   3        24
                82.45          5.29        1.1699    4   4   4         8
                85.57          1.86        1.1349    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.