data_[Rb8Si4O12]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.5567]
_cell_length_b [6.1074]
_cell_length_c [8.1803]
_cell_angle_alpha [90.0000]
_cell_angle_beta [127.0480]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2SiO3]
_chemical_formula_sum '[Rb8 Si4 O12]'
_cell_volume [460.8233]
_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  0.0636  0.5000  0.3406  1
  Rb  Rb1  4  0.1878  0.0000  0.7916  1
  Si  Si2  4  0.1158  0.0000  0.1767  1
  O  O3  4  0.0000  0.1985  0.0000  1
  O  O4  4  0.1157  0.0000  0.3735  1
  O  O5  4  0.2293  0.5000  0.7830  1
]