data_[Na3Ta3Cr6O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ta  1.5000  1.4500  0.8200
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.2519]
_cell_length_b [5.2519]
_cell_length_c [14.1587]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaTaCr2O6]
_chemical_formula_sum '[Na3 Ta3 Cr6 O18]'
_cell_volume [338.2149]
_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
[
  Na  Na0  3  0.0000  0.0000  0.2025  1.0
  Ta  Ta1  3  0.0000  0.0000  0.6866  1.0
  Cr  Cr2  3  0.0000  0.0000  0.4852  1.0
  Cr  Cr3  3  0.0000  0.0000  0.9861  1.0
  O  O4  9  0.0062  0.3473  0.7414  1.0
  O  O5  9  0.0295  0.6127  0.2516  1.0
]