data_[Na4Cr4B2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Cr  1.6600  1.4000  0.9400
  B  2.0400  0.8500  0.4100
]
_symmetry_space_group_name_H-M [P4/mbm]
_cell_length_a [8.6203]
_cell_length_b [8.6203]
_cell_length_c [2.6073]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [127]
_chemical_formula_structural [Na2Cr2B]
_chemical_formula_sum '[Na4 Cr4 B2]'
_cell_volume [193.7530]
_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  4  0.2123  0.2877  0.0000  1
  Cr  Cr1  4  0.0744  0.5744  0.5000  1
  B  B2  2  0.0000  0.0000  0.0000  1
]