data_[Pm8Si2Br6]
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 [Pmn2_1]
_cell_length_a [8.5231]
_cell_length_b [7.9224]
_cell_length_c [7.8831]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [31]
_chemical_formula_structural [Pm4SiBr3]
_chemical_formula_sum '[Pm8 Si2 Br6]'
_cell_volume [532.2936]
_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
[
  Pm  Pm0  4  0.2484  0.6006  0.5729  1
  Pm  Pm1  2  0.0000  0.2289  0.7023  1
  Pm  Pm2  2  0.0000  0.8320  0.1869  1
  Si  Si3  2  0.0000  0.1693  0.0544  1
  Br  Br4  4  0.2366  0.7465  0.9328  1
  Br  Br5  2  0.0000  0.8687  0.5602  1
]