data_[Pm12Er4Sn8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Er  1.2400  1.7500  1.0300
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [18.1742]
_cell_length_b [4.5862]
_cell_length_c [9.8282]
_cell_angle_alpha [90.0000]
_cell_angle_beta [115.6151]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Pm3ErSn2]
_chemical_formula_sum '[Pm12 Er4 Sn8]'
_cell_volume [738.6822]
_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  0.0516  0.0000  0.6884  1
  Pm  Pm1  4  0.1507  0.5000  0.4812  1
  Pm  Pm2  4  0.1909  0.5000  0.8909  1
  Er  Er3  4  0.1135  0.0000  0.1183  1
  Sn  Sn4  4  0.0028  0.5000  0.8540  1
  Sn  Sn5  4  0.2487  0.0000  0.7241  1
]