Millerite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from the powder pattern of R060898
      Grice J D, Ferguson R B
      The Canadian Mineralogist 12 (1974) 248-252
      Crystal structure refinement of millerite (B-NiS)

      CELL PARAMETERS:   9.5970  9.5970  3.1350   90.000   90.000  120.000
      SPACE GROUP: R3m       

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ni     0.91225  -0.91225   0.47546     1.000     4.422
            S      0.11224  -0.11224   0.00000     1.000     5.211

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    0.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  7 +/-  7 +/-  2
            MAX. ABS. INTENSITY / VOLUME**2:      33.91177315    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                18.49         75.25        4.7985    1   1   0
                30.47         55.31        2.9333    1   0   1
                32.31        100.00        2.7704    3   0   0
                35.88         57.42        2.5027    0   2   1
                37.49         12.10        2.3993    2   2   0
                40.66         45.96        2.2190    2   1   1
                49.05         79.92        1.8571    1   3   1
                50.31         34.65        1.8137    4   1   0
                52.86         34.32        1.7319    4   0   1
                56.49         10.38        1.6291    3   2   1
                57.63         18.26        1.5995    3   3   0
                60.06         15.82        1.5403    0   1   2
                63.33          1.52        1.4686    0   5   1
                66.69          2.11        1.4026    1   2   2
                67.63          3.12        1.3852    6   0   0
                70.80          1.98        1.3309    5   2   0
                72.99          6.08        1.2962    3   1   2
                75.97          3.88        1.2526    4   3   1
                76.06          3.61        1.2514    0   4   2
                79.09          1.08        1.2109    2   3   2
                79.98          1.08        1.1996    4   4   0
                82.00          2.35        1.1751    1   6   1
                85.06          2.02        1.1404    5   0   2
                87.94          2.62        1.1104    7   0   1
                88.03          1.44        1.1095    4   2   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.