data_[Ca2Ta2Se6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Ta  1.5000  1.4500  0.8200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [18.7644]
_cell_length_b [3.7229]
_cell_length_c [13.9896]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [CaTaSe3]
_chemical_formula_sum '[Ca2 Ta2 Se6]'
_cell_volume [977.2745]
_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
[
  Ca  Ca0  2  0.5000  0.0000  0.6147  1
  Ta  Ta1  2  0.5000  0.0000  0.3254  1
  Se  Se2  4  0.3997  0.0000  0.2213  1
  Se  Se3  2  0.5000  0.0000  0.9548  1
]