data_[Na8Cr4Ge4Se16]
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
  Ge  2.0100  1.2500  0.7700
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [7.8311]
_cell_length_b [7.9699]
_cell_length_c [11.1399]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [Na2CrGeSe4]
_chemical_formula_sum '[Na8 Cr4 Ge4 Se16]'
_cell_volume [695.2814]
_cell_formula_units_Z [4]
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  0.0000  0.0000  0.0000  1.0
  Na  Na1  4  0.2500  0.2500  0.7500  1.0
  Cr  Cr2  4  0.2500  0.2500  0.2500  1.0
  Ge  Ge3  4  0.0000  0.0000  0.5000  1.0
  Se  Se4  8  0.0000  0.0368  0.2596  1.0
  Se  Se5  8  0.2364  0.2500  0.4789  1.0
]