Tetrahedrite
      Diffraction data computed using the structure from the paper listed below, 
      along with the cell parameters refined from single crystal data of R100204
      Johnson M L, Burnham C W
      American Mineralogist 70 (1985) 165-170
      Crystal structure refinement of an arsenic-bearing argentian tetrahedrite
      _database_code_amcsd 0000964

      CELL PARAMETERS:  10.4910 10.4910 10.4910   90.000   90.000   90.000
      SPACE GROUP: I-43m     

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Cu     0.25000   0.50000   0.00000     0.633     1.189
            Fe     0.25000   0.50000   0.00000     0.240     1.189
            Cu     0.21600   0.00000   0.00000     0.647     5.063
            Ag     0.21600   0.00000   0.00000     0.353     5.063
            Sb     0.26830   0.26830   0.26830     0.675     1.013
            As     0.26830   0.26830   0.26830     0.325     1.013
            S      0.12380   0.12380   0.36610     1.000     2.509
            S      0.00000   0.00000   0.00000     1.000     5.200

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  9 +/-  9 +/-  9
            MAX. ABS. INTENSITY / VOLUME**2:      115.5298406    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                11.93          8.49        7.4183    1   1   0
                16.90          2.08        5.2455    2   0   0
                20.74          1.86        4.2829    2   1   1
                23.99          6.64        3.7091    2   2   0
                26.87          1.20        3.3175    3   1   0
                29.49        100.00        3.0285    2   2   2
                31.92          7.53        2.8038    3   2   1
                34.19         20.87        2.6228    4   0   0
                36.33          6.80        2.4728    4   1   1
                36.33          1.26        2.4728    3   3   0
                38.37          1.33        2.3459    4   2   0
                40.32          3.81        2.2367    3   3   2
                42.20          1.08        2.1415    4   2   2
                44.01          4.08        2.0575    5   1   0
                44.01          5.71        2.0575    4   3   1
                47.47          4.50        1.9154    5   2   1
                49.13         40.13        1.8546    4   4   0
                50.74          1.45        1.7992    4   3   3
                53.87          1.13        1.7019    5   3   2
                53.87          4.66        1.7019    6   1   1
                55.39          1.34        1.6588    6   2   0
                56.88          1.66        1.6188    5   4   1
                58.34         21.06        1.5816    6   2   2
                59.79          2.10        1.5468    6   3   1
                61.21          2.28        1.5142    4   4   4
                62.61          1.10        1.4837    5   4   3
                65.37          1.34        1.4276    6   3   3
                70.71          1.32        1.3324    6   5   1
                70.71          1.23        1.3324    7   3   2
                72.01          3.42        1.3114    8   0   0
                73.31          1.25        1.2914    8   1   1
                73.31          1.01        1.2914    5   5   4
                75.88          2.36        1.2539    6   5   3
                78.42          2.36        1.2196    8   3   1
                79.68          4.80        1.2034    6   6   2
                82.18          1.30        1.1729    8   4   0
                88.39          1.27        1.1058    8   5   1
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.