data_[K2Na4Al2Sb4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Na  0.9300  1.8000  1.1600
  Al  1.6100  1.2500  0.6750
  Sb  2.0500  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Pmc2_1]
_cell_length_a [4.7798]
_cell_length_b [8.8719]
_cell_length_c [8.3051]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [26]
_chemical_formula_structural [KNa2AlSb2]
_chemical_formula_sum '[K2 Na4 Al2 Sb4]'
_cell_volume [352.1862]
_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
[
  K  K0  2  0.0000  0.4247  0.0079  1.0
  Na  Na1  2  0.0000  0.1691  0.3465  1.0
  Na  Na2  2  0.5000  0.0777  0.0272  1.0
  Al  Al3  2  0.5000  0.3332  0.6449  1.0
  Sb  Sb4  2  0.0000  0.1626  0.7158  1.0
  Sb  Sb5  2  0.5000  0.3810  0.3033  1.0
]