data_[Na3U6Ag3Se18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  U  1.3800  1.7500  0.9913
  Ag  1.9300  1.6000  1.0867
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [7.0656]
_cell_length_b [7.0656]
_cell_length_c [19.4512]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaU2AgSe6]
_chemical_formula_sum '[Na3 U6 Ag3 Se18]'
_cell_volume [840.9564]
_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  0.1920  1
  U  U1  3  0.0000  0.0000  0.4939  1
  U  U2  3  0.0000  0.0000  0.9985  1
  Ag  Ag3  3  0.0000  0.0000  0.6764  1
  Se  Se4  9  0.0027  0.3583  0.7469  1
  Se  Se5  9  0.0523  0.7182  0.5787  1
]