data_[Pm6Pr6Er8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Pr  1.1300  1.8500  1.0600
  Er  1.2400  1.7500  1.0300
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [3.6548]
_cell_length_b [13.6732]
_cell_length_c [13.6713]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [Pm3Pr3Er4]
_chemical_formula_sum '[Pm6 Pr6 Er8]'
_cell_volume [683.1942]
_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
[
  Pr  Pr0  4  0.0000  0.2490  0.7505  1
  Pm  Pm1  4  0.5000  0.1746  0.5003  1
  Pr  Pr2  2  0.5000  0.0000  0.1749  1
  Pm  Pm3  2  0.5000  0.0000  0.8249  1
  Er  Er4  4  0.0000  0.1222  0.9987  1
  Er  Er5  2  0.0000  0.0000  0.3791  1
  Er  Er6  2  0.0000  0.0000  0.6221  1
]