data_[Na2Mn8O16]
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/m]
_cell_length_a [10.3566]
_cell_length_b [5.8263]
_cell_length_c [6.7159]
_cell_angle_alpha [90.0000]
_cell_angle_beta [120.8706]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [NaMn4O8]
_chemical_formula_sum '[Na2 Mn8 O16]'
_cell_volume [347.8268]
_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
[
  Na  Na0  2  0.0000  0.0000  0.5000  1.0
  Mn  Mn1  4  0.2500  0.2500  0.0000  1.0
  Mn  Mn2  2  0.0000  0.0000  0.0000  1.0
  Mn  Mn3  2  0.0000  0.5000  0.0000  1.0
  O  O4  8  0.0304  0.2464  0.8323  1.0
  O  O5  4  0.2218  0.0000  0.1707  1.0
  O  O6  4  0.2448  0.5000  0.1820  1.0
]