data_[Mg8Br2N4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Mg  1.3100  1.5000  0.8600
  Br  2.9600  1.1500  0.8825
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [4.7327]
_cell_length_b [4.7327]
_cell_length_c [12.6708]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Mg4BrN2]
_chemical_formula_sum '[Mg8 Br2 N4]'
_cell_volume [283.8018]
_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
[
  Mg  Mg0  4  0.0000  0.0000  0.2871  1
  Mg  Mg1  4  0.0000  0.5000  0.0000  1
  Br  Br2  2  0.0000  0.0000  0.0000  1
  N  N3  4  0.0000  0.0000  0.4431  1
]