data_[Na8Os4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Os  2.2000  1.3000  0.6730
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.8174]
_cell_length_b [11.8709]
_cell_length_c [10.8974]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Na2OsO5]
_chemical_formula_sum '[Na8 Os4 O20]'
_cell_volume [493.8293]
_cell_formula_units_Z [4]
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  8  0.0000  0.1376  0.5617  1.0
  Os  Os1  4  0.0000  0.1554  0.2500  1.0
  O  O2  8  0.0000  0.0462  0.1321  1.0
  O  O3  8  0.0000  0.2647  0.1280  1.0
  O  O4  4  0.0000  0.3402  0.7500  1.0
]