data_[Na6Mg2Cr6O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Mg  1.3100  1.5000  0.8600
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [10.3046]
_cell_length_b [5.9972]
_cell_length_c [6.4496]
_cell_angle_alpha [90.0000]
_cell_angle_beta [122.4252]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3MgCr3O8]
_chemical_formula_sum '[Na6 Mg2 Cr6 O16]'
_cell_volume [336.4358]
_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  0.2500  0.2500  0.0000  1
  Na  Na1  2  0.0000  0.0000  0.0000  1
  Mg  Mg2  2  0.0000  0.0000  0.5000  1
  Cr  Cr3  4  0.2500  0.2500  0.5000  1
  Cr  Cr4  2  0.0000  0.5000  0.5000  1
  O  O5  8  0.0292  0.2546  0.3137  1
  O  O6  4  0.2349  0.5000  0.7012  1
  O  O7  4  0.2383  0.0000  0.6878  1
]