data_[Na4Mn2Si2Se8]
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
  Si  1.9000  1.1000  0.5400
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [I-4]
_cell_length_a [6.6503]
_cell_length_b [6.6503]
_cell_length_c [9.8917]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [82]
_chemical_formula_structural [Na2MnSiSe4]
_chemical_formula_sum '[Na4 Mn2 Si2 Se8]'
_cell_volume [437.4778]
_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  0.0000  1.0
  Na  Na1  2  0.0000  0.5000  0.7500  1.0
  Mn  Mn2  2  0.0000  0.5000  0.2500  1.0
  Si  Si3  2  0.0000  0.0000  0.5000  1.0
  Se  Se4  8  0.1854  0.2260  0.3751  1.0
]