data_K2Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.41
_cell_length_b   17.41
_cell_length_c   17.41
_cell_angle_alpha   166.36
_cell_angle_beta   166.36
_cell_angle_gamma   19.34
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2Pb
_chemical_formula_sum   'K4 Pb2'
_cell_volume   293.53
_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  1  0.0  0.0  0.42  1.0
  K  K1  1  0.07  0.0  0.33  1.0
  K  K2  1  0.0  0.0  0.91  1.0
  K  K3  1  0.07  0.0  0.84  1.0
  Pb  Pb4  1  0.0  0.0  0.0  1.0
  Pb  Pb5  1  0.0  0.07  0.58  1.0

data_K2Pb
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.14
_cell_length_b   4.14
_cell_length_c   17.41
_cell_angle_alpha   96.82
_cell_angle_beta   96.82
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2Pb
_chemical_formula_sum   'K4 Pb2'
_cell_volume   293.53
_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  1  0.09  0.0  0.09  1.0
  K  K1  1  0.16  0.0  0.23  1.0
  K  K2  1  0.58  0.0  0.58  1.0
  K  K3  1  0.67  0.0  0.74  1.0
  Pb  Pb4  1  0.0  0.0  0.0  1.0
  Pb  Pb5  1  0.49  0.07  0.49  1.0

K K K K Pb Pb