The compound described by Cu2S crystallizes in the monoclinic C2/m space group. There are three 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 linear geometry to two equivalent S(1) atoms. In the third Cu site, Cu(3) is bonded in a linear geometry to two equivalent S(1) atoms. S(1) is bonded to one Cu(1), one Cu(3), and two equivalent Cu(2) atoms to form distorted corner-sharing SCu4 trigonal pyramids. is represented by the CIF card [CIF]
data_Cu2S
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.433
_cell_length_b   5.433
_cell_length_c   5.628
_cell_angle_alpha   89.522
_cell_angle_beta   89.522
_cell_angle_gamma   66.146
_symmetry_Int_Tables_number   1
_cell_volume   151.938
_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  0.500  0.500  0.500  1.0
  Cu  Cu1  1  0.500  0.000  0.500  1.0
  Cu  Cu2  1  0.000  0.500  0.500  1.0
  Cu  Cu3  1  0.500  0.500  0.000  1.0
  S  S4  1  0.318  0.318  0.245  1.0
  S  S5  1  0.682  0.682  0.755  1.0
[/CIF]
.
The compound described by Cu2S crystallizes in the monoclinic C2/m space group. There are three 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 linear geometry to two equivalent S(1) atoms. In the third Cu site, Cu(3) is bonded in a linear geometry to two equivalent S(1) atoms. S(1) is bonded to one Cu(1), one Cu(3), and two equivalent Cu(2) atoms to form distorted corner-sharing SCu4 trigonal pyramids. is represented by the CIF card [CIF]
data_Cu2S
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.433
_cell_length_b   5.433
_cell_length_c   5.628
_cell_angle_alpha   89.522
_cell_angle_beta   89.522
_cell_angle_gamma   66.146
_symmetry_Int_Tables_number   1
_cell_volume   151.938
_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  0.500  0.500  0.500  1.0
  Cu  Cu1  1  0.500  0.000  0.500  1.0
  Cu  Cu2  1  0.000  0.500  0.500  1.0
  Cu  Cu3  1  0.500  0.500  0.000  1.0
  S  S4  1  0.318  0.318  0.245  1.0
  S  S5  1  0.682  0.682  0.755  1.0
[/CIF]
.