data_[Na4Mn4O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Mn  1.5500  1.4000  0.6483
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [10.9879]
_cell_length_b [3.1763]
_cell_length_c [5.2376]
_cell_angle_alpha [90.0000]
_cell_angle_beta [101.3480]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaMnO2]
_chemical_formula_sum '[Na4 Mn4 O8]'
_cell_volume [179.2205]
_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  4  0.0000  0.2219  0.2500  1
  Mn  Mn1  4  0.2500  0.2500  0.0000  1
  O  O2  8  0.1497  0.3101  0.6444  1
]