data_[Cu4Ru2Se2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Cu  1.9000  1.3500  0.8200
  Ru  2.2000  1.3000  0.6610
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmm2]
_cell_length_a [2.8847]
_cell_length_b [4.7092]
_cell_length_c [8.7506]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [35]
_chemical_formula_structural [Cu2RuSe]
_chemical_formula_sum '[Cu4 Ru2 Se2]'
_cell_volume [118.8742]
_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  2  0.0000  0.0000  0.9777  1
  Cu  Cu1  2  0.0000  0.5000  0.7513  1
  Ru  Ru2  2  0.0000  0.0000  0.5039  1
  Se  Se3  2  0.0000  0.5000  0.2670  1
]