data_[Pm12Mg2Tl4]
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
  Tl  1.6200  1.9000  1.3325
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [16.3265]
_cell_length_b [7.7223]
_cell_length_c [5.2329]
_cell_angle_alpha [90.0000]
_cell_angle_beta [105.7598]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Pm6MgTl2]
_chemical_formula_sum '[Pm12 Mg2 Tl4]'
_cell_volume [634.9450]
_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  8  0.1666  0.2499  0.1690  1
  Pm  Pm1  4  0.0000  0.2505  0.5000  1
  Mg  Mg2  2  0.0000  0.0000  0.0000  1
  Tl  Tl3  4  0.1661  0.5000  0.6679  1
]