data_[Pm16Er16Hg8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Er  1.2400  1.7500  1.0300
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [Fmmm]
_cell_length_a [7.6137]
_cell_length_b [9.7664]
_cell_length_c [16.7555]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [69]
_chemical_formula_structural [Pm2Er2Hg]
_chemical_formula_sum '[Pm16 Er16 Hg8]'
_cell_volume [1245.9064]
_cell_formula_units_Z [8]
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  16  0.0000  0.2035  0.1012  1
  Er  Er1  8  0.0000  0.0000  0.2952  1
  Er  Er2  8  0.1979  0.0000  0.5000  1
  Hg  Hg3  8  0.2500  0.2500  0.2500  1
]