data_[Rb8Si2O8]
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 [P-1]
_cell_length_a [6.8304]
_cell_length_b [6.9179]
_cell_length_c [9.4611]
_cell_angle_alpha [81.8914]
_cell_angle_beta [73.4746]
_cell_angle_gamma [62.4508]
_symmetry_Int_Tables_number [2]
_chemical_formula_structural [Rb4SiO4]
_chemical_formula_sum '[Rb8 Si2 O8]'
_cell_volume [379.9732]
_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  2  0.0639  0.7617  0.3681  1.0
  Rb  Rb1  2  0.2444  0.7248  0.9631  1.0
  Rb  Rb2  2  0.3652  0.2120  0.8634  1.0
  Rb  Rb3  2  0.4977  0.7316  0.5589  1.0
  Si  Si4  2  0.1406  0.2357  0.2519  1.0
  O  O5  2  0.1291  0.5927  0.6684  1.0
  O  O6  2  0.1484  0.0780  0.1289  1.0
  O  O7  2  0.2705  0.0656  0.3776  1.0
  O  O8  2  0.2899  0.3742  0.1682  1.0
]