Gillardite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from single crystal data of R100074
      Clissold M E, Leverett P, Williams P A, Hibbs D E, Nickel E H
      The Canadian Mineralogist 45 (2007) 317-320
      The structure of gillardite, the Ni-analogue of herbertsmithite, from
      Widgiemooltha, Western Australia
      Locality: 132N deposit, Widgiemooltha, Australia
      AMCSD#0006099

      CELL PARAMETERS:   6.8370  6.8370 13.8820   90.000   90.000  120.000
      SPACE GROUP: R-3m      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Cu     0.50000   0.00000   0.00000     1.000     0.426
            Ni     0.00000   0.00000   0.50000     0.903     0.340
            Cu     0.00000   0.00000   0.50000     0.081     0.340
            Co     0.00000   0.00000   0.50000     0.012     0.340
            Fe     0.00000   0.00000   0.50000     0.004     0.340
            Cl     0.00000   0.00000   0.19330     1.000     0.576
            O      0.20700  -0.20700   0.06240     1.000     0.576
            H      0.14400  -0.14400   0.08580     1.000     1.737

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  5 +/-  5 +/- 12
            MAX. ABS. INTENSITY / VOLUME**2:      48.30391322    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                16.27        100.00        5.4463    1   0   1
                19.18         16.24        4.6273    0   0   3
                19.71          2.92        4.5047    0   1   2
                26.07          4.67        3.4185    1   1   0
                29.84          2.45        2.9941    1   0   4
                30.88         25.78        2.8954    0   2   1
                32.57         78.74        2.7496    1   1   3
                32.89         17.19        2.7232    2   0   2
                38.93         10.56        2.3137    0   0   6
                40.03         64.76        2.2523    0   2   4
                40.84          3.80        2.2094    2   1   1
                44.75         10.66        2.0252    2   0   5
                47.45          1.17        1.9161    1   1   6
                48.40          9.80        1.8805    1   0   7
                50.26         18.78        1.8154    0   3   3
                50.26          5.61        1.8154    3   0   3
                52.52          3.70        1.7424    1   2   5
                53.62         29.11        1.7092    2   2   0
                55.80          4.32        1.6476    0   2   7
                56.42          5.76        1.6308    1   3   1
                57.48          3.00        1.6034    2   2   3
                57.69          1.91        1.5981    3   1   2
                61.78          1.41        1.5016    3   0   6
                61.99          7.71        1.4970    2   0   8
                62.58         11.17        1.4842    2   1   7
                63.17          3.96        1.4719    4   0   1
                64.35          4.93        1.4477    0   4   2
                66.11          1.08        1.4135    3   1   5
                66.50          3.28        1.4060    1   1   9
                68.22         14.84        1.3748    2   2   6
                68.41          2.21        1.3713    1   2   8
                68.97          8.32        1.3616    4   0   4
                69.53          4.33        1.3519    3   2   1
                72.34          2.42        1.3062    0   4   5
                75.11          3.06        1.2648    1   3   7
                75.67          6.54        1.2569    0   2  10
                76.56          3.59        1.2445    1   4   3
                76.56          5.78        1.2445    4   1   3
                83.22          2.76        1.1609    2   0  11
                84.63          1.14        1.1451    2   2   9
                86.40          1.71        1.1262    0   4   8
                86.93          2.44        1.1207    3   2   7
                88.51          1.34        1.1047    4   2   2
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.