Geikielite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R070479
      Liferovich R P, Mitchell R H
      Physics and Chemistry of Minerals 32 (2005) 442-449
      Rhombohedral ilmenite group nickel titanates with Zn, Mg, and Mn:
      synthesis and crystal structures

      CELL PARAMETERS:   5.0490  5.0490 13.8860   90.000   90.000  120.000
      SPACE GROUP: R-3       

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ni     0.00000   0.00000   0.35550     0.333     0.570
            Zn     0.00000   0.00000   0.35550     0.333     0.570
            Mg     0.00000   0.00000   0.35550     0.333     0.570
            Ti     0.00000   0.00000   0.14520     1.000     0.360
            O      0.31880   0.01970   0.24420     1.000     0.200

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    0.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  4 +/-  4 +/- 12
            MAX. ABS. INTENSITY / VOLUME**2:      43.22786951    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                24.05         29.25        3.7000    0   1   2
                32.94        100.00        2.7188    1   0   4
                35.56         66.10        2.5245    1   1   0
                38.91          1.23        2.3143    0   0   6
                40.71          7.55        2.2163    2  -1   3
                40.71         17.78        2.2163    1   1   3
                43.39          1.69        2.0853    2   0   2
                49.26         36.91        1.8500    0   2   4
                53.73         28.94        1.7060    2  -1   6
                53.73         20.18        1.7060    1   1   6
                57.09          8.66        1.6133    0   1   8
                57.31          1.89        1.6078   -1   3   2
                62.21         12.79        1.4922    2   1   4
                62.21         17.61        1.4922    3  -1   4
                63.87         31.91        1.4575    3   0   0
                69.10          2.75        1.3594    2   0   8
                71.25         10.93        1.3235    1   0  10
                71.69          1.57        1.3165    1   1   9
                75.29          6.61        1.2622    2   2   0
                78.55          1.18        1.2178    4  -2   3
                80.20          2.37        1.1969   -1   3   8
                80.20          1.92        1.1969    1   2   8
                80.38          1.30        1.1946    3   1   2
                82.25          5.97        1.1722    0   2  10
                84.65          5.42        1.1449    1   3   4
                84.65          3.42        1.1449   -1   4   4
                88.16          3.61        1.1081    4  -2   6
                88.16          4.86        1.1081    2   2   6
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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.