data_[K4Hg2Pb2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Hg  2.0000  1.5000  1.2450
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [5.5465]
_cell_length_b [3.9297]
_cell_length_c [13.9586]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [K2HgPb]
_chemical_formula_sum '[K4 Hg2 Pb2]'
_cell_volume [304.2486]
_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
[
  K  K0  2  0.0000  0.0000  0.9118  1
  K  K1  2  0.5000  0.0000  0.5913  1
  Hg  Hg2  2  0.5000  0.0000  0.3097  1
  Pb  Pb3  2  0.0000  0.0000  0.1939  1
]