data_[K2Na4Si4]
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
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [12.8568]
_cell_length_b [3.9228]
_cell_length_c [5.9867]
_cell_angle_alpha [90.0000]
_cell_angle_beta [99.3302]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [K(NaSi)2]
_chemical_formula_sum '[K2 Na4 Si4]'
_cell_volume [297.9458]
_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  0.0000  0.0000  1
  Na  Na1  4  0.1535  0.5000  0.5629  1
  Si  Si2  4  0.2267  0.5000  0.0912  1
]