data_[Pm4Y8Cu8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Y  1.2200  1.8000  1.0400
  Cu  1.9000  1.3500  0.8200
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.5514]
_cell_length_b [26.1566]
_cell_length_c [5.1573]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Pm(YCu)2]
_chemical_formula_sum '[Pm4 Y8 Cu8]'
_cell_volume [479.0661]
_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  0.0000  0.1417  0.7500  1
  Y  Y1  4  0.0000  0.0456  0.2500  1
  Y  Y2  4  0.0000  0.2291  0.2500  1
  Cu  Cu3  4  0.0000  0.3607  0.7500  1
  Cu  Cu4  4  0.0000  0.4552  0.2500  1
]