data_[Na2Mn2Be2Se6]
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
  Be  1.5700  1.0500  0.5900
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [8.2407]
_cell_length_b [3.6524]
_cell_length_c [9.1066]
_cell_angle_alpha [90.0000]
_cell_angle_beta [105.2876]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaMnBeSe3]
_chemical_formula_sum '[Na2 Mn2 Be2 Se6]'
_cell_volume [264.3896]
_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  0.1949  0.2500  0.2352  1.0
  Mn  Mn1  2  0.3435  0.7500  0.8641  1.0
  Be  Be2  2  0.0836  0.2500  0.5931  1.0
  Se  Se3  2  0.1261  0.2500  0.8477  1.0
  Se  Se4  2  0.2002  0.7500  0.5148  1.0
  Se  Se5  2  0.4552  0.7500  0.1611  1.0
]