data_[Rb12Si4O14]
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 [P2_1/c]
_cell_length_a [6.6966]
_cell_length_b [9.1656]
_cell_length_c [11.2490]
_cell_angle_alpha [90.0000]
_cell_angle_beta [125.3705]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Rb6Si2O7]
_chemical_formula_sum '[Rb12 Si4 O14]'
_cell_volume [563.0035]
_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  0.0144  0.1467  0.4075  1
  Rb  Rb1  4  0.2063  0.5251  0.4534  1
  Rb  Rb2  4  0.3893  0.2243  0.2766  1
  Si  Si3  4  0.3318  0.6322  0.8750  1
  O  O4  4  0.0826  0.6562  0.8692  1
  O  O5  4  0.2700  0.5775  0.7181  1
  O  O6  4  0.4958  0.2208  0.0673  1
  O  O7  2  0.5000  0.0000  0.5000  1
]