data_[Rb2Si8O14]
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 [Pmn2_1]
_cell_length_a [13.9245]
_cell_length_b [5.5756]
_cell_length_c [5.0616]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [31]
_chemical_formula_structural [RbSi4O7]
_chemical_formula_sum '[Rb2 Si8 O14]'
_cell_volume [392.9713]
_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  0.0000  0.9990  0.2015  1
  Si  Si1  4  0.0915  0.5413  0.6785  1
  Si  Si2  4  0.2447  0.1675  0.4612  1
  O  O3  4  0.1451  0.2942  0.5538  1
  O  O4  4  0.1678  0.6444  0.9125  1
  O  O5  4  0.2185  0.0192  0.1907  1
  O  O6  2  0.0000  0.4224  0.8601  1
]