data_[Pm8Zn12Si16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Zn  1.6500  1.3500  0.8800
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [Cmce]
_cell_length_a [5.6887]
_cell_length_b [15.1820]
_cell_length_c [7.6931]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [64]
_chemical_formula_structural [Pm2Zn3Si4]
_chemical_formula_sum '[Pm8 Zn12 Si16]'
_cell_volume [664.4321]
_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  8  0.0000  0.1138  0.4141  1
  Zn  Zn1  8  0.2500  0.2143  0.7500  1
  Zn  Zn2  4  0.0000  0.0000  0.0000  1
  Si  Si3  8  0.0000  0.1896  0.0424  1
  Si  Si4  8  0.2500  0.0508  0.7500  1
]