The structure described by KNa4Cl5 is Caswellsilverite-like structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded to two Cl(1,1) and four equivalent Cl(2) atoms to form KCl6 octahedra that share corners with two equivalent Na(2)Cl6 octahedra, corners with four equivalent K(1)Cl6 octahedra, edges with four equivalent K(1)Cl6 octahedra, and edges with eight equivalent Na(1)Cl6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one Cl(2), one Cl(3), and four equivalent Cl(1) atoms to form NaCl6 octahedra that share  a cornercorner with one Na(2)Cl6 octahedra, corners with five equivalent Na(1)Cl6 octahedra, edges with four equivalent K(1)Cl6 octahedra, edges with four equivalent Na(1)Cl6 octahedra, and edges with four equivalent Na(2)Cl6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Na site, Na(2) is bonded to one Cl(1) and five equivalent Cl(3) atoms to form NaCl6 octahedra that share  a cornercorner with one K(1)Cl6 octahedra,  a cornercorner with one Na(1)Cl6 octahedra, corners with four equivalent Na(2)Cl6 octahedra, edges with four equivalent Na(1)Cl6 octahedra, and edges with eight equivalent Na(2)Cl6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are four inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to one K(1), one Na(2), and four equivalent Na(1) atoms to form ClKNa5 octahedra that share  a cornercorner with one Cl(3)Na6 octahedra; corners with five Cl(1,1)KNa5 octahedra; edges with four equivalent Cl(2)K4Na2 octahedra; edges with four equivalent Cl(1)KNa5 octahedra; and edges with four equivalent Cl(3)Na6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Cl site, Cl(2) is bonded to four equivalent K(1) and two equivalent Na(1) atoms to form ClK4Na2 octahedra that share corners with two equivalent Cl(3)Na6 octahedra; corners with four equivalent Cl(2)K4Na2 octahedra; edges with four equivalent Cl(2)K4Na2 octahedra; and edges with eight Cl(1,1)KNa5 octahedra. The corner-sharing octahedra are not tilted. In the third Cl site, Cl(1) is bonded to one K(1), one Na(2), and four equivalent Na(1) atoms to form ClKNa5 octahedra that share  a cornercorner with one Cl(3)Na6 octahedra, corners with five equivalent Cl(1)KNa5 octahedra, edges with four equivalent Cl(2)K4Na2 octahedra, edges with four equivalent Cl(1)KNa5 octahedra, and edges with four equivalent Cl(3)Na6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fourth Cl site, Cl(3) is bonded to one Na(1) and five equivalent Na(2) atoms to form ClNa6 octahedra that share  a cornercorner with one Cl(2)K4Na2 octahedra,  a cornercorner with one Cl(1)KNa5 octahedra, corners with four equivalent Cl(3)Na6 octahedra, edges with four equivalent Cl(1)KNa5 octahedra, and edges with eight equivalent Cl(3)Na6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. is represented by the CIF file [CIF]
data_KNa4Cl5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.809
_cell_length_b   14.809
_cell_length_c   14.809
_cell_angle_alpha   163.825
_cell_angle_beta   163.825
_cell_angle_gamma   22.952
_symmetry_Int_Tables_number   1
_cell_volume   251.990
_cell_formula_units_Z   1
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  1  0.000  0.000  0.000  1.0
  Na  Na1  1  0.397  0.397  0.000  1.0
  Na  Na2  1  0.798  0.798  0.000  1.0
  Na  Na3  1  0.202  0.202  0.000  1.0
  Na  Na4  1  0.603  0.603  0.000  1.0
  Cl  Cl5  1  0.105  0.105  0.000  1.0
  Cl  Cl6  1  0.500  0.500  0.000  1.0
  Cl  Cl7  1  0.895  0.895  0.000  1.0
  Cl  Cl8  1  0.299  0.299  0.000  1.0
  Cl  Cl9  1  0.701  0.701  0.000  1.0
[/CIF]
.
The structure described by KNa4Cl5 is Caswellsilverite-like structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded to two Cl(1,1) and four equivalent Cl(2) atoms to form KCl6 octahedra that share corners with two equivalent Na(2)Cl6 octahedra, corners with four equivalent K(1)Cl6 octahedra, edges with four equivalent K(1)Cl6 octahedra, and edges with eight equivalent Na(1)Cl6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one Cl(2), one Cl(3), and four equivalent Cl(1) atoms to form NaCl6 octahedra that share  a cornercorner with one Na(2)Cl6 octahedra, corners with five equivalent Na(1)Cl6 octahedra, edges with four equivalent K(1)Cl6 octahedra, edges with four equivalent Na(1)Cl6 octahedra, and edges with four equivalent Na(2)Cl6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Na site, Na(2) is bonded to one Cl(1) and five equivalent Cl(3) atoms to form NaCl6 octahedra that share  a cornercorner with one K(1)Cl6 octahedra,  a cornercorner with one Na(1)Cl6 octahedra, corners with four equivalent Na(2)Cl6 octahedra, edges with four equivalent Na(1)Cl6 octahedra, and edges with eight equivalent Na(2)Cl6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are four inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to one K(1), one Na(2), and four equivalent Na(1) atoms to form ClKNa5 octahedra that share  a cornercorner with one Cl(3)Na6 octahedra; corners with five Cl(1,1)KNa5 octahedra; edges with four equivalent Cl(2)K4Na2 octahedra; edges with four equivalent Cl(1)KNa5 octahedra; and edges with four equivalent Cl(3)Na6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Cl site, Cl(2) is bonded to four equivalent K(1) and two equivalent Na(1) atoms to form ClK4Na2 octahedra that share corners with two equivalent Cl(3)Na6 octahedra; corners with four equivalent Cl(2)K4Na2 octahedra; edges with four equivalent Cl(2)K4Na2 octahedra; and edges with eight Cl(1,1)KNa5 octahedra. The corner-sharing octahedra are not tilted. In the third Cl site, Cl(1) is bonded to one K(1), one Na(2), and four equivalent Na(1) atoms to form ClKNa5 octahedra that share  a cornercorner with one Cl(3)Na6 octahedra, corners with five equivalent Cl(1)KNa5 octahedra, edges with four equivalent Cl(2)K4Na2 octahedra, edges with four equivalent Cl(1)KNa5 octahedra, and edges with four equivalent Cl(3)Na6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fourth Cl site, Cl(3) is bonded to one Na(1) and five equivalent Na(2) atoms to form ClNa6 octahedra that share  a cornercorner with one Cl(2)K4Na2 octahedra,  a cornercorner with one Cl(1)KNa5 octahedra, corners with four equivalent Cl(3)Na6 octahedra, edges with four equivalent Cl(1)KNa5 octahedra, and edges with eight equivalent Cl(3)Na6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. is represented by the CIF file [CIF]
data_KNa4Cl5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.809
_cell_length_b   14.809
_cell_length_c   14.809
_cell_angle_alpha   163.825
_cell_angle_beta   163.825
_cell_angle_gamma   22.952
_symmetry_Int_Tables_number   1
_cell_volume   251.990
_cell_formula_units_Z   1
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  1  0.000  0.000  0.000  1.0
  Na  Na1  1  0.397  0.397  0.000  1.0
  Na  Na2  1  0.798  0.798  0.000  1.0
  Na  Na3  1  0.202  0.202  0.000  1.0
  Na  Na4  1  0.603  0.603  0.000  1.0
  Cl  Cl5  1  0.105  0.105  0.000  1.0
  Cl  Cl6  1  0.500  0.500  0.000  1.0
  Cl  Cl7  1  0.895  0.895  0.000  1.0
  Cl  Cl8  1  0.299  0.299  0.000  1.0
  Cl  Cl9  1  0.701  0.701  0.000  1.0
[/CIF]
.