data_[Sr3Ta6Si4O26]
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
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P-62m]
_cell_length_a [8.9012]
_cell_length_b [8.9012]
_cell_length_c [7.5913]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [189]
_chemical_formula_structural [Sr3Ta6(Si2O13)2]
_chemical_formula_sum '[Sr3 Ta6 Si4 O26]'
_cell_volume [520.8855]
_cell_formula_units_Z [1]
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  3  0.0000  0.6038  0.0000  1
  Ta  Ta1  6  0.0000  0.2385  0.2562  1
  Si  Si2  4  0.3333  0.6667  0.7133  1
  O  O3  12  0.1763  0.4906  0.2008  1
  O  O4  6  0.0000  0.8094  0.2807  1
  O  O5  3  0.0000  0.2050  0.0000  1
  O  O6  3  0.0000  0.2971  0.5000  1
  O  O7  2  0.3333  0.6667  0.5000  1
]