data_[Rb4Si2Pb2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Si  1.9000  1.1000  0.5400
  Pb  2.3300  1.8000  1.1225
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pmmn]
_cell_length_a [5.9688]
_cell_length_b [7.8907]
_cell_length_c [6.5276]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [59]
_chemical_formula_structural [Rb2SiPbO4]
_chemical_formula_sum '[Rb4 Si2 Pb2 O8]'
_cell_volume [307.4393]
_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
[
  Rb  Rb0  4  0.0000  0.2385  0.7705  1.0
  Si  Si1  2  0.0000  0.5000  0.3431  1.0
  Pb  Pb2  2  0.0000  0.0000  0.2745  1.0
  O  O3  4  0.0000  0.3248  0.2060  1.0
  O  O4  4  0.2269  0.5000  0.4954  1.0
]