CuSe2
      Heyding R D, Murray R M
      Canadian Journal of Chemistry 54 (1976) 841-848
      Crystal structures of Cu1.8Se, Cu3Se2, alpha- and gamma-CuSe, CuSe2, and CuSe2II
      Note: low-pressure polymorph, marcasite structure
      _database_code_amcsd 0012161

      CELL PARAMETERS:    5.0050   6.1820   3.7400   90.000   90.000   90.000
      SPACE GROUP: Pnnm      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    115.719
      Density (g/cm3):      6.355
      MAX. ABS. INTENSITY / VOLUME**2:      65.05491675    
      RIR:      3.333
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.86          4.40        3.8899    1   1   0         4
                27.88         19.60        3.2000    0   1   1         4
                28.88         24.03        3.0910    0   2   0         2
                29.82        100.00        2.9959    1   0   1         4
                33.23         79.52        2.6960    1   1   1         8
                34.09         82.94        2.6299    1   2   0         4
                35.88          3.01        2.5025    2   0   0         2
                38.82         16.09        2.3197    2   1   0         4
                42.00         21.52        2.1513    1   2   1         8
                46.04         63.10        1.9713    2   1   1         8
                46.70          3.51        1.9450    2   2   0         4
                47.73         13.11        1.9055    1   3   0         4
                48.69         31.04        1.8700    0   0   2         2
                50.57         25.30        1.8048    0   3   1         4
                53.07         25.59        1.7256    2   2   1         8
                54.01         25.75        1.6978    1   3   1         8
                57.19         21.28        1.6107    3   1   0         4
                57.61          4.31        1.6000    0   2   2         4
                57.98          6.48        1.5908    2   3   0         4
                59.84          2.87        1.5455    0   4   0         2
                60.78         24.21        1.5240    1   2   2         8
                60.79          5.08        1.5236    3   0   1         4
                61.95          1.40        1.4980    2   0   2         4
                62.81          1.17        1.4793    3   1   1         8
                63.35          1.28        1.4681    3   2   0         4
                63.95          5.79        1.4558    2   1   2         8
                69.76          1.11        1.3480    2   2   2         8
                70.57          5.31        1.3347    1   3   2         8
                71.79          7.70        1.3149    2   4   0         4
                77.90          2.57        1.2264    4   1   0         4
                78.22          1.11        1.2221    0   1   3         4
                78.35         12.20        1.2204    3   1   2         8
                79.03          4.20        1.2117    2   3   2         8
                79.18          2.86        1.2097    1   0   3         4
                79.92          2.43        1.2003    1   5   0         4
                80.65          2.29        1.1913    0   4   2         4
                80.99          3.80        1.1872    1   1   3         8
                82.10          7.09        1.1739    0   5   1         4
                82.84          1.31        1.1653    4   1   1         8
                84.84          1.54        1.1429    1   5   1         8
                86.37          1.01        1.1265    1   2   3         8
                88.20          7.71        1.1078    4   2   1         8
                89.18          4.84        1.0981    2   1   3         8
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.