Retgersite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R070665
      O'Connor B H, Dale D H
      Acta Crystallographica 21 (1966) 705-709
      A neutron diffraction analysis of the crystal
      structure of tetragonal nickel sulphate hexadeuterate
      Locality: synthetic

      CELL PARAMETERS:   6.7850  6.7850 18.2760   90.000   90.000   90.000
      SPACE GROUP: P4_12_12  

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ni     0.21010   0.21010   0.00000     1.000     1.200
            S      0.71260   0.71260   0.00000     1.000     1.700
            O      0.62260   0.61910   0.06480     1.000     2.700
            O      0.92480   0.67570  -0.00030     1.000     1.900
            O      0.17140  -0.04890   0.05180     1.000     2.300
            O      0.47200   0.24490   0.05640     1.000     1.400
            O      0.06410   0.35640   0.08520     1.000     1.700
            D      0.07540  -0.14090   0.03990     1.000     2.400
            D      0.24930  -0.08620   0.09590     1.000     2.800
            D      0.56790   0.14110   0.04930     1.000     3.300
            D      0.54230   0.36860   0.05650     1.000     2.200
            D     -0.01150   0.46750   0.06810     1.000     3.000
            D     -0.01780   0.27330   0.11550     1.000     2.300

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  6 +/-  6 +/- 16
            MAX. ABS. INTENSITY / VOLUME**2:      21.50139773    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                13.92          7.98        6.3608    1   0   1
                19.13          6.76        4.6405    1   1   1
                19.43         33.75        4.5690    0   0   4
                20.91        100.00        4.2478    1   1   2
                23.60          4.56        3.7692    1   1   3
                26.27          9.30        3.3925    2   0   0
                26.73          4.58        3.3355    2   0   1
                28.06          1.99        3.1804    2   0   2
                30.15         15.39        2.9639    2   0   3
                30.75          2.52        2.9075    1   1   5
                31.06          2.24        2.8797    2   1   2
                32.21          1.81        2.7788    1   0   6
                32.88         16.50        2.7238    2   0   4
                34.89         12.83        2.5715    1   1   6
                35.51          5.18        2.5277    2   1   4
                38.56         11.30        2.3347    2   1   5
                39.29          1.22        2.2933    1   1   7
                40.18          1.22        2.2445    3   0   1
                41.72          1.01        2.1651    1   0   8
                42.42          6.94        2.1310    3   1   1
                42.57          3.57        2.1239    2   2   4
                42.64          3.82        2.1203    3   0   3
                43.32          5.20        2.0888    3   1   2
                44.71          1.18        2.0269    3   0   4
                44.78          3.45        2.0238    3   1   3
                45.85          3.70        1.9791    2   1   7
                46.77          1.09        1.9421    3   1   4
                48.01          5.62        1.8949    2   0   8
                48.37          2.06        1.8818    3   2   0
                49.24          4.65        1.8504    3   1   5
                49.45          1.09        1.8431    3   2   2
                49.97          3.05        1.8251    2   1   8
                52.14          6.08        1.7541    3   1   6
                53.67          4.42        1.7079    1   1  10
                54.31          2.92        1.6890    4   0   1
                55.43          1.30        1.6577    3   1   7
                55.55          3.72        1.6543    2   2   8
                56.12          1.38        1.6390    4   1   1
                56.30          2.57        1.6341    4   0   3
                57.88          1.02        1.5932    3   3   1
                60.14          1.87        1.5386    4   0   5
                61.31          1.69        1.5120    4   2   1
                63.03          1.19        1.4749    3   1   9
                65.64          1.10        1.4224    4   0   7
                66.76          1.57        1.4013    4   2   5
                67.30          1.14        1.3913    3   1  10
                67.40          1.19        1.3894    2   0  12
                67.91          1.01        1.3803    3   2   9
                72.74          1.47        1.3000    5   1   3
                75.47          1.50        1.2596    1   1  14
                76.13          1.16        1.2504    5   1   5
                80.82          1.06        1.1892    4   4   2
                81.12          1.65        1.1856    5   1   7
                87.68          1.17        1.1130    5   1   9
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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.