Gahnite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R070591
      Saalfeld H
      Zeitschrift fur Kristallographie 120 (1964) 476-478
      Strukturdaten von gahnit, ZnAl2O4
      Locality: Falun, Sweden

      CELL PARAMETERS:   8.0990  8.0990  8.0990   90.000   90.000   90.000
      SPACE GROUP: Fd3m      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Zn     0.00000   0.00000   0.00000     0.790     0.700
            Mg     0.00000   0.00000   0.00000     0.210     0.800
            Al     0.62500   0.62500   0.62500     0.950     0.600
            Mg     0.62500   0.62500   0.62500     0.013     0.800
            Fe     0.62500   0.62500   0.62500     0.038     0.700
            O      0.38400   0.38400   0.38400     1.000     1.000

            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:      49.75971051    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                18.98          2.39        4.6760    1   1   1
                31.24         63.56        2.8634    2   2   0
                36.81        100.00        2.4419    3   1   1
                44.76          8.04        2.0247    4   0   0
                49.03          4.60        1.8580    3   3   1
                55.59         20.59        1.6532    4   2   2
                59.29          5.14        1.5587    3   3   3
                59.29         30.05        1.5587    5   1   1
                65.16         44.30        1.4317    4   4   0
                74.03          7.25        1.2806    6   2   0
                77.24          9.05        1.2351    5   3   3
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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.