data_[K2Si2Pb4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Si  1.9000  1.1000  0.5400
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [Imm2]
_cell_length_a [4.0896]
_cell_length_b [4.6024]
_cell_length_c [14.0886]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [44]
_chemical_formula_structural [KSiPb2]
_chemical_formula_sum '[K2 Si2 Pb4]'
_cell_volume [265.1744]
_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  0.5000  0.1952  1
  Si  Si1  2  0.0000  0.0000  0.4741  1
  Pb  Pb2  2  0.0000  0.0000  0.9957  1
  Pb  Pb3  2  0.0000  0.5000  0.8350  1
]