data_K2SiPb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.66
_cell_length_b   6.66
_cell_length_c   6.66
_cell_angle_alpha   142.47
_cell_angle_beta   127.42
_cell_angle_gamma   66.38
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2SiPb
_chemical_formula_sum   'K2 Si1 Pb1'
_cell_volume   141.08
_cell_formula_units_Z   1
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  0.95  0.16  1.0
  K  K1  1  0.0  0.0  0.06  1.0
  Si  Si3  1  0.0  0.0  0.86  1.0
  Pb  Pb2  1  0.0  0.95  0.65  1.0

data_K2SiPb
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.29
_cell_length_b   5.9
_cell_length_c   6.66
_cell_angle_alpha   116.29
_cell_angle_beta   108.77
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2SiPb
_chemical_formula_sum   'K2 Si1 Pb1'
_cell_volume   141.08
_cell_formula_units_Z   1
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  0.84  0.79  0.79  1.0
  K  K1  1  0.94  0.94  0.94  1.0
  Si  Si2  1  0.14  0.14  0.14  1.0
  Pb  Pb3  1  0.35  0.3  0.3  1.0

K K Si Pb
K K Si Pb 0 1 o + o 1 2 o o - 2 3 o - o 