data_[Pm3Zn36Cu18]
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
  Cu  1.9000  1.3500  0.8200
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [10.9977]
_cell_length_b [10.9977]
_cell_length_c [8.5134]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [Pm(Zn2Cu)6]
_chemical_formula_sum '[Pm3 Zn36 Cu18]'
_cell_volume [891.7435]
_cell_formula_units_Z [3]
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  3  0.0000  0.0000  0.0000  1
  Zn  Zn1  18  0.0000  0.3867  0.5000  1
  Zn  Zn2  18  0.0859  0.1719  0.3136  1
  Cu  Cu3  18  0.0505  0.5252  0.2454  1
]