Proustite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from the powder pattern of R060356
      Allen S
      Phase Transition 6 (1985) 1-24
      Phase transitions in proustite I. Structural studies
      Sample: T = 300 K
      Note: calculated Ag-S bondlengths do not match those reported

      CELL PARAMETERS:  10.8418 10.8418  8.7200   90.000   90.000  120.000
      SPACE GROUP: R3c       

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ag     0.24380   0.30350   0.23110     1.000     6.960
            As     0.00000   0.00000   0.00000     1.000     2.340
            S      0.21270   0.09250   0.37600     1.000     2.590

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  8 +/-  8 +/-  8
            MAX. ABS. INTENSITY / VOLUME**2:      41.33138492    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                16.35         20.99        5.4209    1   1   0
                22.48          4.86        3.9544    0   1   2
                27.13        100.00        3.2870    2   1   1
                27.93         74.96        3.1947    2   0   2
                28.52         51.68        3.1298    3   0   0
                32.53         98.50        2.7523    1   2   2
                33.05          6.67        2.7104    2   2   0
                35.03         93.24        2.5617    1   1   3
                35.99         96.60        2.4952    1   3   1
                40.34         23.77        2.2357    3   1   2
                42.57          5.15        2.1235    1   0   4
                43.26         17.03        2.0912    3   2   1
                43.80          1.70        2.0668    0   4   2
                44.20          7.95        2.0489    4   1   0
                45.77          2.80        1.9823    2   2   3
                45.90          6.65        1.9772    0   2   4
                47.05         33.56        1.9312    2   3   2
                49.04         13.95        1.8575    2   1   4
                50.51          3.92        1.8070    3   3   0
                52.64          8.46        1.7388    2   4   1
                53.10         12.38        1.7247    5   0   2
                54.82          1.62        1.6747    1   4   3
                54.82          2.26        1.6747    4   1   3
                54.93         20.25        1.6716    1   3   4
                55.95          9.59        1.6435    4   2   2
                57.71          7.46        1.5974    4   0   4
                58.70          4.93        1.5728    1   5   2
                59.01          3.77        1.5652    1   2   5
                59.03          8.39        1.5649    6   0   0
                60.31          1.63        1.5346    3   3   3
                60.42          1.20        1.5322    3   2   4
                60.95          3.22        1.5200    4   3   1
                61.69         11.22        1.5035    5   2   0
                63.99          2.88        1.4551    3   4   2
                64.07          2.43        1.4533    0   0   6
                64.28          5.13        1.4491    3   1   5
                66.62          4.83        1.4038    1   1   6
                68.14          2.69        1.3762    2   4   4
                69.04          2.30        1.3604    6   1   2
                69.33          1.16        1.3554    2   3   5
                70.52          2.03        1.3354    2   5   3
                70.52          1.41        1.3354    5   2   3
                70.61          1.49        1.3339    5   1   4
                73.55          1.31        1.2878    6   2   1
                76.60          1.30        1.2438    4   2   5
                76.62          1.18        1.2436    7   1   0
                80.21          2.34        1.1968    1   6   4
                81.13          1.43        1.1854    4   1   6
                83.40          1.11        1.1589    4   5   2
                84.79          1.23        1.1434    1   7   3
                84.79          1.43        1.1434    7   1   3
                85.80          1.21        1.1325    3   3   6
                87.20          1.93        1.1178    6   2   4
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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.