Stannite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from the powder pattern of R050187
      Bonazzi P, Bindi L, Bernardini G P, Menchetti S
      The Canadian Mineralogist 41 (2003) 639-647
      A model for the mechanism of incorporation of Cu, Fe and Zn in the
      stannite - kesterite series, Cu2FeSnS4 - Cu2ZnSnS4
      Sample: Fe100
      _database_code_amcsd 0005838

      CELL PARAMETERS:   5.4550  5.4550 10.7770   90.000   90.000   90.000
      SPACE GROUP: I-42m     

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Cu     0.00000   0.50000   0.25000     1.000     1.519
            Fe     0.00000   0.00000   0.00000     1.000     0.962
            Sn     0.00000   0.00000   0.50000     1.000     0.809
            S      0.75581   0.75581   0.87012     1.000     0.895

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  5 +/-  5 +/-  9
            MAX. ABS. INTENSITY / VOLUME**2:      137.5749006    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                18.23          7.71        4.8670    1   0   1
                23.06          1.26        3.8573    1   1   0
                28.46        100.00        3.1365    1   1   2
                29.78          3.01        3.0002    1   0   3
                32.84          9.44        2.7275    2   0   0
                33.25          4.60        2.6943    0   0   4
                36.94          1.06        2.4335    2   0   2
                37.81          3.14        2.3794    2   1   1
                44.91          1.53        2.0182    2   1   3
                47.12         18.22        1.9286    2   2   0
                47.43         35.53        1.9168    2   0   4
                55.97         23.59        1.6429    3   1   2
                56.52         11.36        1.6283    1   1   6
                58.89          3.03        1.5682    2   2   4
                68.85          4.72        1.3637    4   0   0
                69.82          2.22        1.3471    0   0   8
                76.11          3.87        1.2506    3   3   2
                76.58          7.55        1.2442    3   1   6
                87.86          8.45        1.1112    4   2   4
                88.54          4.10        1.1044    2   2   8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.