Sylvanite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R070504
      Tunell G
      American Mineralogist 26 (1941) 457-477
      The atomic arrangement of sylvanite

      CELL PARAMETERS:   8.9470  4.4870 14.6700   90.000  145.440   90.000
      SPACE GROUP: P2/c      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Au     0.00000   0.00000   0.00000     1.000     1.000
            Ag     0.00000   0.43300   0.25000     1.000     1.000
            Te     0.29800   0.03100   0.99900     1.000     1.000
            Te     0.27700   0.42500   0.23500     1.000     1.000

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  4 +/-  4 +/-  7
            MAX. ABS. INTENSITY / VOLUME**2:      282.6118297    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                12.07          5.73        7.3348   -1   0   2
                17.47         11.51        5.0754    1   0   0
                19.79          3.01        4.4870    0   1   0
                21.22          1.73        4.1864   -2   0   2
                21.35          1.44        4.1609    0   0   2
                22.51          8.55        3.9495    0   1   1
                23.24          6.81        3.8276   -1   1   2
                29.17          1.32        3.0610   -2   1   2
                29.27        100.00        3.0510    0   1   2
                29.97         39.89        2.9818   -3   0   4
                36.17          1.38        2.4835   -3   1   4
                36.33          1.67        2.4728   -1   1   4
                37.64          2.39        2.3897   -3   1   5
                38.14          1.95        2.3595    0   1   3
                40.20         14.69        2.2435    0   2   0
                41.70          5.01        2.1662    0   2   1
                42.09         29.10        2.1469   -3   1   6
                42.68         23.56        2.1184   -3   1   2
                42.82          3.28        2.1117    1   1   2
                43.22          7.47        2.0932   -4   0   4
                43.50         17.06        2.0805    0   0   4
                44.13          1.77        2.0520    1   2   0
                45.80          9.51        1.9814   -4   1   6
                45.96          2.08        1.9747    0   2   2
                50.94         10.78        1.7927   -3   2   4
                52.07          1.14        1.7565   -3   2   5
                52.32          2.39        1.7486   -3   2   3
                52.46          2.23        1.7444    0   2   3
                54.22          5.28        1.6918    3   0   0
                56.08          1.13        1.6399   -3   2   2
                58.43          1.32        1.5794   -4   2   5
                59.68          5.43        1.5493   -4   1   2
                60.49          3.33        1.5305   -4   2   4
                60.71          7.47        1.5255    0   2   4
                61.25          1.81        1.5133   -3   2   7
                63.16          1.91        1.4721    0   3   1
                66.42          3.10        1.4075    0   3   2
                69.60          3.18        1.3508    3   2   0
                70.43          1.03        1.3369   -3   3   4
                71.15          5.68        1.3251    0   1   6
                71.36          1.57        1.3217   -3   3   5
                71.69          1.20        1.3165    0   3   3
                74.35          1.76        1.2759   -3   3   6
                74.76          1.64        1.2698   -3   3   2
                74.83          1.58        1.2688    4   0   0
                79.69          2.33        1.2032    3   1   2
                88.54          1.23        1.1044    4   2   0
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.