data_[Na1Nb3Si5]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Nb  1.6000  1.4500  0.8200
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [P6/mmm]
_cell_length_a [5.6252]
_cell_length_b [5.6252]
_cell_length_c [6.4294]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [191]
_chemical_formula_structural [NaNb3Si5]
_chemical_formula_sum '[Na1 Nb3 Si5]'
_cell_volume [176.1899]
_cell_formula_units_Z [1]
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  1  0.0000  0.0000  0.0000  1
  Nb  Nb1  3  0.0000  0.5000  0.5000  1
  Si  Si2  4  0.3333  0.6667  0.1803  1
  Si  Si3  1  0.0000  0.0000  0.5000  1
]