data_[Sr6Ta3Tl3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Ta  1.5000  1.4500  0.8200
  Tl  1.6200  1.9000  1.3325
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [5.8811]
_cell_length_b [5.8811]
_cell_length_c [14.0847]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [Sr2TaTlO6]
_chemical_formula_sum '[Sr6 Ta3 Tl3 O18]'
_cell_volume [421.8909]
_cell_formula_units_Z [3]
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
[
  Sr  Sr0  6  0.0000  0.0000  0.2524  1
  Ta  Ta1  3  -0.0000  0.0000  0.5000  1
  Tl  Tl2  3  0.0000  0.0000  0.0000  1
  O  O3  18  0.0254  0.4328  0.2473  1
]