data_[Np2Cu2Pb2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Np  1.3600  1.7500  1.0000
  Cu  1.9000  1.3500  0.8200
  Pb  2.3300  1.8000  1.1225
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [7.1077]
_cell_length_b [5.7727]
_cell_length_c [8.7436]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.3795]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NpCuPbSe4]
_chemical_formula_sum '[Np2 Cu2 Pb2 Se8]'
_cell_volume [342.3808]
_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
[
  Np  Np0  2  0.2638  0.2500  0.5568  1
  Cu  Cu1  2  0.2540  0.7500  0.3242  1
  Pb  Pb2  2  0.2796  0.2500  0.0532  1
  Se  Se3  4  0.0221  0.5097  0.7246  1
  Se  Se4  2  0.4298  0.7500  0.6019  1
  Se  Se5  2  0.4360  0.7500  0.1312  1
]