Tiemannite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050550
      Earley J W
      American Mineralogist 35 (1950) 337-364
      Description and syntheses of the selenide minerals

      CELL PARAMETERS:   6.014286   6.014286   6.014286   90.00000   90.00000   90.00000
      SPACE GROUP: F-43m
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                25.65        100.00        3.4723    1   1   1
                29.70         15.59        3.0071    2   0   0
                42.50         63.65        2.1264    2   2   0
                50.29         44.78        1.8134    3   1   1
                52.69          3.98        1.7362    2   2   2
                61.65          9.75        1.5036    4   0   0
                67.89         16.73        1.3798    3   3   1
                69.91          4.63        1.3448    4   2   0
                77.74         18.40        1.2277    4   2   2
                83.46          8.80        1.1574    5   1   1
                83.46          2.93        1.1574    3   3   3
                83.46          2.93        1.1574    3   3   3
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.