data_[Rb2Na2Ta2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Na  0.9300  1.8000  1.1600
  Ta  1.5000  1.4500  0.8200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [7.4466]
_cell_length_b [6.3988]
_cell_length_c [9.9983]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.7522]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbNaTaSe4]
_chemical_formula_sum '[Rb2 Na2 Ta2 Se8]'
_cell_volume [456.1934]
_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
[
  Rb  Rb0  2  0.2727  0.7500  0.0534  1.0
  Na  Na1  2  0.2463  0.7500  0.5540  1.0
  Ta  Ta2  2  0.2375  0.2500  0.3285  1.0
  Se  Se3  4  0.0030  0.0202  0.7314  1.0
  Se  Se4  2  0.4035  0.2500  0.5711  1.0
  Se  Se5  2  0.4365  0.2500  0.1767  1.0
]