data_[Pm2Pr8Se10]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Pr  1.1300  1.8500  1.0600
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [4.2500]
_cell_length_b [6.0050]
_cell_length_c [21.3060]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [PmPr4Se5]
_chemical_formula_sum '[Pm2 Pr8 Se10]'
_cell_volume [543.7546]
_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
[
  Pr  Pr0  4  0.0000  0.0000  0.1991  1
  Pr  Pr1  4  0.0000  0.0000  0.3998  1
  Pm  Pm2  2  0.0000  0.0000  0.0000  1
  Se  Se3  4  0.0000  0.5000  0.2005  1
  Se  Se4  4  0.0000  0.5000  0.4021  1
  Se  Se5  2  0.0000  0.5000  0.0000  1
]