Stenhuggarite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R080038
      Coda A, Dal Negro A, Sabelli C, Tazzoli V
      Acta Crystallographica B33 (1977) 1807-1811
      The crystal structure of stenhuggarite

      CELL PARAMETERS:  16.1650 16.1650 10.7200   90.000   90.000   90.000
      ALTERNATE SETTING FOR SPACE GROUP: I4_1/a    

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ca     0.34930   0.43880  -0.47680     1.000     0.480
            Fe     0.23730   0.25750  -0.49160     1.000     0.410
            Sb     0.32658   0.42697   0.01620     1.000     0.700
            As     0.38500   0.29810  -0.26150     1.000     0.560
            As     0.39730   0.31460  -0.70390     1.000     0.410
            O      0.32720   0.31540  -0.12250     1.000     1.080
            O      0.25270   0.48450  -0.10070     1.000     0.590
            O      0.24680   0.34480   0.08060     1.000     0.820
            O      0.30490   0.31000  -0.37380     1.000     0.960
            O      0.30200   0.32830  -0.63170     1.000     0.700
            O      0.42010   0.40080  -0.28830     1.000     1.130
            O      0.45440   0.33890  -0.56120     1.000     0.820

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/- 14 +/- 14 +/-  9
            MAX. ABS. INTENSITY / VOLUME**2:      94.83392039    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                10.95          5.07        8.0825    2   0   0
                14.78          8.62        5.9937    2   1   1
                18.28          2.78        4.8529    1   1   2
                18.43          2.87        4.8144    3   0   1
                21.48          1.05        4.1362    3   2   1
                21.48          3.04        4.1362    2   3   1
                21.99          2.50        4.0413    4   0   0
                24.17          2.60        3.6821    4   1   1
                24.17          6.90        3.6821    1   4   1
                24.63          5.73        3.6146    4   2   0
                25.53          7.64        3.4891    1   0   3
                27.64          4.73        3.2268    4   0   2
                27.85          3.61        3.2034    1   2   3
                28.75          1.47        3.1055    3   3   2
                28.84          7.53        3.0953    5   0   1
                29.81          5.39        2.9968    4   2   2
                29.81         94.61        2.9968    2   4   2
                30.01          5.50        2.9780    3   0   3
                30.94          1.33        2.8906    5   2   1
                32.82          1.42        2.7287    5   1   2
                33.44         10.46        2.6800    0   0   4
                34.37          2.28        2.6092    1   1   4
                34.78          1.51        2.5794    6   1   1
                34.78          1.16        2.5794    1   6   1
                35.11         18.78        2.5559    6   2   0
                35.60          5.68        2.5216    4   4   2
                36.49          1.52        2.4624    3   5   2
                44.26          1.12        2.0467    5   1   4
                44.86          1.61        2.0206    8   0   0
                45.40          1.33        1.9979    6   3   3
                46.05          1.73        1.9708    7   4   1
                46.32          1.41        1.9603    2   8   0
                46.98          1.18        1.9342    2   3   5
                47.74          1.89        1.9051    6   6   0
                47.87          2.64        1.9000    6   0   4
                48.13          1.25        1.8907    8   0   2
                48.39          2.90        1.8811    1   4   5
                49.27         16.73        1.8496    6   2   4
                49.27          1.53        1.8496    2   6   4
                49.51          1.68        1.8410    2   8   2
                50.50          6.97        1.8073    4   8   0
                50.87          1.37        1.7951    6   6   2
                50.99          1.40        1.7910    5   6   3
                51.12          2.70        1.7868    5   0   5
                52.32          1.75        1.7486    7   4   3
                52.45          1.48        1.7447    2   5   5
                52.91          2.13        1.7303    6   7   1
                52.91          1.34        1.7303    2   9   1
                54.91          1.11        1.6721    3   8   3
                56.92          1.23        1.6176    3   3   6
                56.97          1.02        1.6165    6   8   0
                57.54          6.05        1.6017    2   4   6
                58.32          1.58        1.5822    2   8   4
                58.65          3.11        1.5741    2   9   3
                59.75          5.25        1.5476    8   6   2
                59.75          6.00        1.5476   10   0   2
                60.75          1.67        1.5246    1   0   7
                60.95          1.86        1.5200   10   2   2
                61.93          3.63        1.4984    4   8   4
                63.53          1.02        1.4644    1   8   5
                64.47          1.15        1.4453   10   4   2
                65.10          1.06        1.4329   11   2   1
                68.82          1.14        1.3642    5   2   7
                69.22          1.01        1.3573    6   7   5
                70.12          1.23        1.3420    6  10   2
                70.93          1.13        1.3288    2  12   0
                73.23          1.06        1.2925    6   3   7
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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.