data_[Pm8Si4]
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
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [14.0361]
_cell_length_b [3.6927]
_cell_length_c [6.5709]
_cell_angle_alpha [90.0000]
_cell_angle_beta [104.0635]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Pm2Si]
_chemical_formula_sum '[Pm8 Si4]'
_cell_volume [330.3695]
_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  4  0.1190  0.5000  0.5664  1
  Pm  Pm1  4  0.1493  0.5000  0.0910  1
  Si  Si2  4  0.0018  0.0000  0.8088  1
]