data_[Y2Cu2Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Y  1.2200  1.8000  1.0400
  Cu  1.9000  1.3500  0.8200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2/m]
_cell_length_a [6.4672]
_cell_length_b [4.0844]
_cell_length_c [7.0544]
_cell_angle_alpha [90.0000]
_cell_angle_beta [91.2537]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [YCuSe2]
_chemical_formula_sum '[Y2 Cu2 Se4]'
_cell_volume [186.2939]
_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
[
  Y  Y0  1  0.0000  0.0000  0.0000  1.0
  Y  Y1  1  0.0000  0.5000  0.5000  1.0
  Cu  Cu2  2  0.3628  0.5000  0.8401  1.0
  Se  Se3  2  0.2542  0.5000  0.1736  1.0
  Se  Se4  2  0.2566  0.0000  0.6692  1.0
]