Trevorite
Diffraction data computed using the structure from the paper listed below,  along with the cell parameters refined from single crystal data of R140860
      Blesa M C, Amador U, Moran E, Menendez N, Tornero J D, Rodriguez-Carvajal J
      Solid State Ionics 63 (1993) 429-436
      Synthesis and characterization of nickel and magnesium ferrites obtained from
      alpha-NaFeO2
      Locality: synthetic
      _database_code_amcsd 0015511

      CELL PARAMETERS:   8.3350  8.3350  8.3350   90.000   90.000   90.000
      SPACE GROUP: Fd-3m     

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ni     0.62500   0.62500   0.62500     0.595     0.280
            Fe     0.62500   0.62500   0.62500     0.405     0.280
            Fe     0.00000   0.00000   0.00000     0.890     0.260
            Ni     0.12500   0.12500   0.12500     0.120     0.700
            O      0.37980   0.37980   0.37980     1.000     1.900

            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:      79.95581628    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                18.44          9.58        4.8122    1   1   1
                30.33         26.55        2.9469    2   2   0
                35.73        100.00        2.5131    3   1   1
                37.37         22.51        2.4061    2   2   2
                43.43         35.24        2.0838    4   0   0
                53.89          9.10        1.7014    4   2   2
                57.45          6.60        1.6041    3   3   3
                57.45         25.49        1.6041    5   1   1
                63.10         54.99        1.4734    4   4   0
                66.35          1.36        1.4089    5   3   1
                71.60          3.40        1.3179    6   2   0
                74.68          9.30        1.2711    5   3   3
                75.69         10.95        1.2565    6   2   2
                79.70          4.70        1.2031    4   4   4
                87.60          3.83        1.1138    6   4   2
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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.