data_[Pm4Mg2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Mg  1.3100  1.5000  0.8600
]
_symmetry_space_group_name_H-M [Pmma]
_cell_length_a [6.2536]
_cell_length_b [3.4212]
_cell_length_c [20.8838]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [51]
_chemical_formula_structural [Pm2Mg]
_chemical_formula_sum '[Pm4 Mg2]'
_cell_volume [446.8070]
_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
[
  Pm  Pm0  2  0.2500  0.0000  0.3840  1
  Pm  Pm1  2  0.2500  0.5000  0.6409  1
  Mg  Mg2  2  0.0000  0.5000  0.5000  1
]