data_[Na8Pm8O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Pm  1.1300  1.8500  1.1100
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [21.1359]
_cell_length_b [4.0668]
_cell_length_c [8.1945]
_cell_angle_alpha [90.0000]
_cell_angle_beta [92.1804]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [NaPmO]
_chemical_formula_sum '[Na8 Pm8 O8]'
_cell_volume [703.8560]
_cell_formula_units_Z [8]
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
[
  Na  Na0  4  0.0478  0.0000  0.3376  1
  Na  Na1  4  0.0676  0.5000  0.8758  1
  Pm  Pm2  4  0.1972  0.0000  0.6204  1
  Pm  Pm3  4  0.1985  0.0000  0.1195  1
  O  O4  4  0.2499  0.0000  0.8735  1
  O  O5  4  0.2499  0.0000  0.3763  1
]