data_[Pm8Sm4Hg8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Sm  1.1700  1.8500  1.2290
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.8205]
_cell_length_b [27.8794]
_cell_length_c [5.4352]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Pm2SmHg2]
_chemical_formula_sum '[Pm8 Sm4 Hg8]'
_cell_volume [578.9155]
_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  0.0454  0.2500  1
  Pm  Pm1  4  0.0000  0.2342  0.2500  1
  Sm  Sm2  4  0.0000  0.1465  0.7500  1
  Hg  Hg3  4  0.0000  0.3583  0.7500  1
  Hg  Hg4  4  0.0000  0.4491  0.2500  1
]