data_[Nd4Sm4Se6O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Nd  1.1400  1.8500  1.2765
  Sm  1.1700  1.8500  1.2290
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [8.4322]
_cell_length_b [3.9709]
_cell_length_c [12.8021]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [Nd2Sm2Se3O4]
_chemical_formula_sum '[Nd4 Sm4 Se6 O8]'
_cell_volume [428.6597]
_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
[
  Nd  Nd0  4  0.2629  0.0000  0.6835  1
  Sm  Sm1  2  0.0000  0.0000  0.0172  1
  Sm  Sm2  2  0.5000  0.0000  0.0007  1
  Se  Se3  4  0.1487  0.0000  0.3567  1
  Se  Se4  2  0.5000  0.0000  0.3134  1
  O  O5  4  0.2557  0.0000  0.0851  1
  O  O6  2  0.0000  0.0000  0.6144  1
  O  O7  2  0.5000  0.0000  0.5863  1
]