data_[Tl4Si4O14]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tl  1.6200  1.9000  1.3325
  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 [6.9858]
_cell_length_b [8.9708]
_cell_length_c [4.8033]
_cell_angle_alpha [90.0000]
_cell_angle_beta [103.0546]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Tl2Si2O7]
_chemical_formula_sum '[Tl4 Si4 O14]'
_cell_volume [293.2343]
_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
[
  Tl  Tl0  4  0.0000  0.3051  0.0000  1.0
  Si  Si1  4  0.2128  0.0000  0.4128  1.0
  O  O2  8  0.2323  0.1520  0.2269  1.0
  O  O3  4  0.1167  0.5000  0.2881  1.0
  O  O4  2  0.0000  0.0000  0.5000  1.0
]