The compound described by Cu2S crystallizes in the monoclinic C2/c space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a linear geometry to two equivalent S(1) atoms. In the second Cu site, Cu(2) is bonded in a distorted trigonal planar geometry to three equivalent S(1) atoms. S(1) is bonded in a distorted pentagonal planar geometry to two equivalent Cu(1) and three equivalent Cu(2) atoms. is represented by the CIF file [CIF]
data_Cu2S
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.933
_cell_length_b   3.933
_cell_length_c   7.174
_cell_angle_alpha   88.853
_cell_angle_beta   88.853
_cell_angle_gamma   118.846
_symmetry_Int_Tables_number   1
_cell_volume   97.136
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Cu  Cu0  1  0.000  0.500  0.500  1.0
  Cu  Cu1  1  0.500  0.000  0.000  1.0
  Cu  Cu2  1  0.018  0.982  0.250  1.0
  Cu  Cu3  1  0.982  0.018  0.750  1.0
  S  S4  1  0.367  0.633  0.250  1.0
  S  S5  1  0.633  0.367  0.750  1.0
[/CIF]
.
The compound described by Cu2S crystallizes in the monoclinic C2/c space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a linear geometry to two equivalent S(1) atoms. In the second Cu site, Cu(2) is bonded in a distorted trigonal planar geometry to three equivalent S(1) atoms. S(1) is bonded in a distorted pentagonal planar geometry to two equivalent Cu(1) and three equivalent Cu(2) atoms. is represented by the CIF file [CIF]
data_Cu2S
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.933
_cell_length_b   3.933
_cell_length_c   7.174
_cell_angle_alpha   88.853
_cell_angle_beta   88.853
_cell_angle_gamma   118.846
_symmetry_Int_Tables_number   1
_cell_volume   97.136
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Cu  Cu0  1  0.000  0.500  0.500  1.0
  Cu  Cu1  1  0.500  0.000  0.000  1.0
  Cu  Cu2  1  0.018  0.982  0.250  1.0
  Cu  Cu3  1  0.982  0.018  0.750  1.0
  S  S4  1  0.367  0.633  0.250  1.0
  S  S5  1  0.633  0.367  0.750  1.0
[/CIF]
.