data_[Pm20Si8Br8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Si  1.9000  1.1000  0.5400
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [Cmce]
_cell_length_a [15.3054]
_cell_length_b [7.8662]
_cell_length_c [7.8372]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [64]
_chemical_formula_structural [Pm5(SiBr)2]
_chemical_formula_sum '[Pm20 Si8 Br8]'
_cell_volume [943.5622]
_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  16  0.1269  0.1672  0.3354  1
  Pm  Pm1  4  0.0000  0.0000  0.0000  1
  Si  Si2  8  0.0000  0.1289  0.6283  1
  Br  Br3  8  0.2001  0.0000  0.0000  1
]