data_[K6Na4Sb2O12]
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
  Sb  2.0500  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [6.0901]
_cell_length_b [10.4874]
_cell_length_c [6.3597]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.7187]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [K3Na2SbO6]
_chemical_formula_sum '[K6 Na4 Sb2 O12]'
_cell_volume [384.7043]
_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  4  0.0000  0.1782  0.5000  1.0
  K  K1  2  0.0000  0.5000  0.5000  1.0
  Na  Na2  4  0.0000  0.3334  0.0000  1.0
  Sb  Sb3  2  0.0000  0.0000  0.0000  1.0
  O  O4  8  0.2012  0.1382  0.1899  1.0
  O  O5  4  0.2083  0.0000  0.8084  1.0
]