data_[Pm12Pr4Mg4]
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
  Mg  1.3100  1.5000  0.8600
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.8156]
_cell_length_b [18.8943]
_cell_length_c [9.7536]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Pm3PrMg]
_chemical_formula_sum '[Pm12 Pr4 Mg4]'
_cell_volume [703.1784]
_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  0.4003  0.5044  1
  Pr  Pr1  4  0.0000  0.0119  0.7500  1
  Pm  Pm2  4  0.0000  0.1992  0.7500  1
  Mg  Mg3  4  0.0000  0.1649  0.2500  1
]