data_[Pm20Sn8O4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Sn  1.9600  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [4.7387]
_cell_length_b [16.9444]
_cell_length_c [12.8385]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Pm5Sn2O]
_chemical_formula_sum '[Pm20 Sn8 O4]'
_cell_volume [1030.8664]
_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
[
  Pm  Pm0  8  0.0000  0.0978  0.1096  1
  Pm  Pm1  8  0.0000  0.3021  0.0665  1
  Pm  Pm2  4  0.0000  0.2731  0.7500  1
  Sn  Sn3  8  0.0000  0.0879  0.6397  1
  O  O4  4  0.0000  0.1921  0.2500  1
]