data_[Sm8Se12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sm  1.1700  1.8500  1.2290
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [7.2988]
_cell_length_b [12.6241]
_cell_length_c [7.2141]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.4960]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Sm2Se3]
_chemical_formula_sum '[Sm8 Se12]'
_cell_volume [626.5973]
_cell_formula_units_Z [4]
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
[
  Sm  Sm0  4  0.0000  0.3314  0.5000  1.0
  Sm  Sm1  2  0.0000  0.0000  0.5000  1.0
  Sm  Sm2  2  0.0000  0.5000  0.0000  1.0
  Se  Se3  8  0.2487  0.3378  0.2576  1.0
  Se  Se4  4  0.2375  0.5000  0.7431  1.0
]