data_[Pm8Mg20Sn16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Mg  1.3100  1.5000  0.8600
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Fmmm]
_cell_length_a [6.1742]
_cell_length_b [11.8257]
_cell_length_c [16.4291]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [69]
_chemical_formula_structural [Pm2Mg5Sn4]
_chemical_formula_sum '[Pm8 Mg20 Sn16]'
_cell_volume [1199.5491]
_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  0.0000  0.1531  1
  Mg  Mg1  8  0.2500  0.2500  0.0000  1
  Mg  Mg2  8  0.2500  0.2500  0.2500  1
  Mg  Mg3  4  0.0000  0.0000  0.5000  1
  Sn  Sn4  16  0.0000  0.1268  0.3583  1
]