data_[Na2Ga4Cu2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ga  1.8100  1.3000  0.7600
  Cu  1.9000  1.3500  0.8200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [I-42m]
_cell_length_a [5.6770]
_cell_length_b [5.6770]
_cell_length_c [12.3091]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [121]
_chemical_formula_structural [NaGa2CuSe4]
_chemical_formula_sum '[Na2 Ga4 Cu2 Se8]'
_cell_volume [396.7083]
_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
[
  Na  Na0  2  0.0000  0.0000  0.0000  1.0
  Ga  Ga1  4  0.0000  0.5000  0.2500  1.0
  Cu  Cu2  2  0.0000  0.0000  0.5000  1.0
  Se  Se3  8  0.2280  0.2280  0.6331  1.0
]