Spinel
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R110101
      Peterson R C, Lager G A, Hitterman R L
      American Mineralogist 76 (1991) 1455-1458
      A time-of-flight neutron powder diffraction study of MgAl2O4 at temperatures
      up to 1273 K
      sample W, T = 293 K
      _database_code_amcsd 0001398

      CELL PARAMETERS:   7.9380  7.9380  7.9380   90.000   90.000   90.000
      ALTERNATE SETTING FOR SPACE GROUP: Fd3m      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Mg     0.12500   0.12500   0.12500     0.680     0.240
            Al     0.12500   0.12500   0.12500     0.320     0.240
            Al     0.50000   0.50000   0.50000     0.840     0.700
            Mg     0.50000   0.50000   0.50000     0.160     0.700
            O      0.26148   0.26148   0.26148     1.000     0.530

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  7 +/-  7 +/-  7
            MAX. ABS. INTENSITY / VOLUME**2:      19.98839271    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                19.37         28.67        4.5830    1   1   1
                31.89         33.64        2.8065    2   2   0
                37.58        100.00        2.3934    3   1   1
                39.32          1.40        2.2915    2   2   2
                45.72         54.22        1.9845    4   0   0
                56.82          9.86        1.6203    4   2   2
                60.61          3.27        1.5277    3   3   3
                60.61         41.09        1.5277    5   1   1
                66.65         70.15        1.4033    4   4   0
                70.14          2.25        1.3418    5   3   1
                75.79          3.29        1.2551    6   2   0
                79.11          9.78        1.2105    5   3   3
                84.57          6.01        1.1458    4   4   4
                87.82          2.10        1.1115    5   5   1
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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.