data_[Rb8Ca4Pb4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Ca  1.0000  1.8000  1.1400
  Pb  2.3300  1.8000  1.1225
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [7.2507]
_cell_length_b [7.4737]
_cell_length_c [10.2792]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [Rb2CaPbO4]
_chemical_formula_sum '[Rb8 Ca4 Pb4 O16]'
_cell_volume [557.0313]
_cell_formula_units_Z [4]
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  0.0000  0.5000  1
  Rb  Rb1  4  0.2500  0.2500  0.2500  1
  Ca  Ca2  4  0.0000  0.0000  0.0000  1
  Pb  Pb3  4  0.2500  0.2500  0.7500  1
  O  O4  8  0.0000  0.0455  0.7640  1
  O  O5  8  0.2172  0.2500  0.9652  1
]