data_[Li8Mg8Nb8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Li  0.9800  1.4500  0.9000
  Mg  1.3100  1.5000  0.8600
  Nb  1.6000  1.4500  0.8200
]
_symmetry_space_group_name_H-M [Fmmm]
_cell_length_a [4.7092]
_cell_length_b [8.2804]
_cell_length_c [11.3086]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [69]
_chemical_formula_structural [LiMgNb]
_chemical_formula_sum '[Li8 Mg8 Nb8]'
_cell_volume [440.9644]
_cell_formula_units_Z [8]
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
[
  Li  Li0  8  0.2500  0.2500  0.2500  1
  Mg  Mg1  8  0.0000  0.0000  0.3754  1
  Nb  Nb2  8  0.0000  0.1693  0.0000  1
]