Ferroselite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R070461
      Pickardt J, Reuter B, Riedel E, Sochtig J
      Journal of Solid State Chemistry 15 (1975) 366-368
      On the formation of FeSe2 single crystals by chemical transport reactions
      Locality: synthetic

      CELL PARAMETERS:   4.7950  5.7700  3.5840   90.000   90.000   90.000
      SPACE GROUP: Pnnm      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Fe     0.00000   0.00000   0.00000     1.000     0.644
            Se     0.21340   0.36900   0.00000     1.000     0.716

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    0.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  4 +/-  5 +/-  3
            MAX. ABS. INTENSITY / VOLUME**2:      90.49279801    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                24.13         12.95        3.6878    1   1   0
                29.34         14.93        3.0445    0   1   1
                31.00          6.12        2.8850    0   2   0
                31.16         49.02        2.8707    1   0   1
                34.91        100.00        2.5702    1   1   1
                36.34         82.29        2.4720    1   2   0
                37.51         10.90        2.3975    2   0   0
                40.76          6.58        2.2140    2   1   0
                44.52         11.76        2.0349    1   2   1
                48.32         69.93        1.8836    2   1   1
                49.43          6.42        1.8439    2   2   0
                50.96         28.84        1.7920    0   0   2
                51.17          9.01        1.7851    1   3   0
                54.12         33.40        1.6947    0   3   1
                56.09          8.88        1.6396    2   2   1
                57.15          1.79        1.6118    1   1   2
                57.69         15.19        1.5979    1   3   1
                60.06         11.29        1.5403    3   1   0
                60.85          1.37        1.5222    0   2   2
                61.84          1.25        1.5002    2   3   0
                63.76          1.18        1.4598    3   0   1
                64.19         27.33        1.4509    1   2   2
                64.61          2.86        1.4425    0   4   0
                64.97          4.10        1.4354    2   0   2
                66.02          8.45        1.4152    3   1   1
                66.93          7.47        1.3981    3   2   0
                67.21          2.64        1.3929    2   1   2
                67.71          2.98        1.3839    2   3   1
                72.58          3.03        1.3025    3   2   1
                73.72          3.16        1.2851    2   2   2
                75.12          4.77        1.2647    1   3   2
                77.18         12.11        1.2360    2   4   0
                80.05          3.23        1.1988    4   0   0
                82.12          2.27        1.1737    4   1   0
                82.60          7.85        1.1681    3   1   2
                83.06          2.99        1.1628    3   3   1
                83.37          2.06        1.1592    1   0   3
                85.42          6.12        1.1365    1   1   3
                86.64          2.45        1.1237    0   4   2
                86.80          1.25        1.1220    1   5   0
                88.75          6.46        1.1023    3   2   2
                89.15          4.36        1.0985    0   5   1
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.