The material described by KSnS4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one S(1), one S(2), one S(3), one S(4), one S(5), and one S(7) atom. In the second K site, K(2) is bonded in a 8-coordinate geometry to one S(1), one S(2), one S(3), one S(4), one S(5), one S(7), and two equivalent S(8) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one S(1), one S(3), one S(5), and two equivalent S(2) atoms to form distorted SnS5 trigonal bipyramids that share edges with two equivalent Sn(2)S6 octahedra and  an edgeedge with one Sn(1)S5 trigonal bipyramid. In the second Sn site, Sn(2) is bonded to one S(1), one S(4), one S(5), one S(8), and two equivalent S(3) atoms to form SnS6 octahedra that share  a cornercorner with one S(7)K2S2 trigonal pyramid,  an edgeedge with one Sn(2)S6 octahedra, and edges with two equivalent Sn(1)S5 trigonal bipyramids. There are eight inequivalent S sites. In the first S site, S(5) is bonded to one K(1), one K(2), one Sn(1), and one Sn(2) atom to form distorted SK2Sn2 trigonal pyramids that share  a cornercorner with one S(3)K2Sn3 square pyramid,  a cornercorner with one S(4)K2SnS tetrahedra, corners with two equivalent S(7)K2S2 trigonal pyramids, corners with two equivalent S(1)K2Sn2 trigonal pyramids, corners with two equivalent S(2)K2Sn2 trigonal pyramids, edges with two equivalent S(3)K2Sn3 square pyramids,  an edgeedge with one S(4)K2SnS tetrahedra,  an edgeedge with one S(1)K2Sn2 trigonal pyramid, and  an edgeedge with one S(2)K2Sn2 trigonal pyramid. In the second S site, S(6) is bonded in a water-like geometry to one S(4) and one S(7) atom. In the third S site, S(7) is bonded to one K(1), one K(2), one S(6), and one S(8) atom to form distorted SK2S2 trigonal pyramids that share  a cornercorner with one Sn(2)S6 octahedra, corners with two equivalent S(3)K2Sn3 square pyramids,  a cornercorner with one S(4)K2SnS tetrahedra, corners with two equivalent S(1)K2Sn2 trigonal pyramids, corners with two equivalent S(2)K2Sn2 trigonal pyramids, corners with two equivalent S(5)K2Sn2 trigonal pyramids, and  an edgeedge with one S(4)K2SnS tetrahedra. The corner-sharing octahedral tilt angles are 79°. In the fourth S site, S(8) is bonded in a 3-coordinate geometry to two equivalent K(2), one Sn(2), and one S(7) atom. In the fifth S site, S(1) is bonded to one K(1), one K(2), one Sn(1), and one Sn(2) atom to form distorted SK2Sn2 trigonal pyramids that share  a cornercorner with one S(3)K2Sn3 square pyramid, corners with three equivalent S(4)K2SnS tetrahedra, corners with two equivalent S(7)K2S2 trigonal pyramids, corners with two equivalent S(5)K2Sn2 trigonal pyramids, corners with four equivalent S(2)K2Sn2 trigonal pyramids, edges with two equivalent S(3)K2Sn3 square pyramids, and  an edgeedge with one S(5)K2Sn2 trigonal pyramid. In the sixth S site, S(2) is bonded to one K(1), one K(2), and two equivalent Sn(1) atoms to form distorted SK2Sn2 trigonal pyramids that share corners with two equivalent S(3)K2Sn3 square pyramids, corners with two equivalent S(4)K2SnS tetrahedra, corners with two equivalent S(7)K2S2 trigonal pyramids, corners with two equivalent S(5)K2Sn2 trigonal pyramids, corners with four equivalent S(1)K2Sn2 trigonal pyramids,  an edgeedge with one S(3)K2Sn3 square pyramid,  an edgeedge with one S(2)K2Sn2 trigonal pyramid, and  an edgeedge with one S(5)K2Sn2 trigonal pyramid. In the seventh S site, S(3) is bonded to one K(1), one K(2), one Sn(1), and two equivalent Sn(2) atoms to form SK2Sn3 square pyramids that share corners with four equivalent S(4)K2SnS tetrahedra,  a cornercorner with one S(1)K2Sn2 trigonal pyramid,  a cornercorner with one S(5)K2Sn2 trigonal pyramid, corners with two equivalent S(7)K2S2 trigonal pyramids, corners with two equivalent S(2)K2Sn2 trigonal pyramids,  an edgeedge with one S(3)K2Sn3 square pyramid,  an edgeedge with one S(2)K2Sn2 trigonal pyramid, edges with two equivalent S(1)K2Sn2 trigonal pyramids, and edges with two equivalent S(5)K2Sn2 trigonal pyramids. In the eighth S site, S(4) is bonded to one K(1), one K(2), one Sn(2), and one S(6) atom to form distorted SK2SnS tetrahedra that share corners with four equivalent S(3)K2Sn3 square pyramids,  a cornercorner with one S(7)K2S2 trigonal pyramid,  a cornercorner with one S(5)K2Sn2 trigonal pyramid, corners with two equivalent S(2)K2Sn2 trigonal pyramids, corners with three equivalent S(1)K2Sn2 trigonal pyramids,  an edgeedge with one S(7)K2S2 trigonal pyramid, and  an edgeedge with one S(5)K2Sn2 trigonal pyramid. is represented by the CIF file [CIF]
data_KSnS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.065
_cell_length_b   9.658
_cell_length_c   14.613
_cell_angle_alpha   68.707
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1323.485
_cell_formula_units_Z   8
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  0.362  0.856  0.797  1.0
  K  K1  1  0.862  0.144  0.703  1.0
  K  K2  1  0.638  0.144  0.203  1.0
  K  K3  1  0.138  0.856  0.297  1.0
  K  K4  1  0.273  0.373  0.596  1.0
  K  K5  1  0.773  0.627  0.904  1.0
  K  K6  1  0.727  0.627  0.404  1.0
  K  K7  1  0.227  0.373  0.096  1.0
  Sn  Sn8  1  0.173  0.987  0.984  1.0
  Sn  Sn9  1  0.673  0.013  0.516  1.0
  Sn  Sn10  1  0.827  0.013  0.016  1.0
  Sn  Sn11  1  0.327  0.987  0.484  1.0
  Sn  Sn12  1  0.000  0.810  0.595  1.0
  Sn  Sn13  1  0.500  0.190  0.905  1.0
  Sn  Sn14  1  1.000  0.190  0.405  1.0
  Sn  Sn15  1  0.500  0.810  0.095  1.0
  S  S16  1  0.275  0.745  0.036  1.0
  S  S17  1  0.775  0.255  0.464  1.0
  S  S18  1  0.725  0.255  0.964  1.0
  S  S19  1  0.225  0.745  0.536  1.0
  S  S20  1  0.040  0.080  0.086  1.0
  S  S21  1  0.540  0.920  0.414  1.0
  S  S22  1  0.960  0.920  0.914  1.0
  S  S23  1  0.460  0.080  0.586  1.0
  S  S24  1  0.900  0.935  0.423  1.0
  S  S25  1  0.400  0.065  0.077  1.0
  S  S26  1  0.100  0.065  0.577  1.0
  S  S27  1  0.600  0.935  0.923  1.0
  S  S28  1  0.067  0.711  0.779  1.0
  S  S29  1  0.567  0.289  0.721  1.0
  S  S30  1  0.933  0.289  0.221  1.0
  S  S31  1  0.433  0.711  0.279  1.0
  S  S32  1  0.272  0.153  0.834  1.0
  S  S33  1  0.772  0.847  0.666  1.0
  S  S34  1  0.728  0.847  0.166  1.0
  S  S35  1  0.228  0.153  0.334  1.0
  S  S36  1  0.143  0.506  0.804  1.0
  S  S37  1  0.643  0.494  0.696  1.0
  S  S38  1  0.857  0.494  0.196  1.0
  S  S39  1  0.357  0.506  0.304  1.0
  S  S40  1  0.344  0.539  0.772  1.0
  S  S41  1  0.844  0.461  0.728  1.0
  S  S42  1  0.656  0.461  0.228  1.0
  S  S43  1  0.156  0.539  0.272  1.0
  S  S44  1  0.440  0.453  0.903  1.0
  S  S45  1  0.940  0.547  0.597  1.0
  S  S46  1  0.560  0.547  0.097  1.0
  S  S47  1  0.060  0.453  0.403  1.0
[/CIF]
.
The material described by KSnS4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one S(1), one S(2), one S(3), one S(4), one S(5), and one S(7) atom. In the second K site, K(2) is bonded in a 8-coordinate geometry to one S(1), one S(2), one S(3), one S(4), one S(5), one S(7), and two equivalent S(8) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one S(1), one S(3), one S(5), and two equivalent S(2) atoms to form distorted SnS5 trigonal bipyramids that share edges with two equivalent Sn(2)S6 octahedra and  an edgeedge with one Sn(1)S5 trigonal bipyramid. In the second Sn site, Sn(2) is bonded to one S(1), one S(4), one S(5), one S(8), and two equivalent S(3) atoms to form SnS6 octahedra that share  a cornercorner with one S(7)K2S2 trigonal pyramid,  an edgeedge with one Sn(2)S6 octahedra, and edges with two equivalent Sn(1)S5 trigonal bipyramids. There are eight inequivalent S sites. In the first S site, S(5) is bonded to one K(1), one K(2), one Sn(1), and one Sn(2) atom to form distorted SK2Sn2 trigonal pyramids that share  a cornercorner with one S(3)K2Sn3 square pyramid,  a cornercorner with one S(4)K2SnS tetrahedra, corners with two equivalent S(7)K2S2 trigonal pyramids, corners with two equivalent S(1)K2Sn2 trigonal pyramids, corners with two equivalent S(2)K2Sn2 trigonal pyramids, edges with two equivalent S(3)K2Sn3 square pyramids,  an edgeedge with one S(4)K2SnS tetrahedra,  an edgeedge with one S(1)K2Sn2 trigonal pyramid, and  an edgeedge with one S(2)K2Sn2 trigonal pyramid. In the second S site, S(6) is bonded in a water-like geometry to one S(4) and one S(7) atom. In the third S site, S(7) is bonded to one K(1), one K(2), one S(6), and one S(8) atom to form distorted SK2S2 trigonal pyramids that share  a cornercorner with one Sn(2)S6 octahedra, corners with two equivalent S(3)K2Sn3 square pyramids,  a cornercorner with one S(4)K2SnS tetrahedra, corners with two equivalent S(1)K2Sn2 trigonal pyramids, corners with two equivalent S(2)K2Sn2 trigonal pyramids, corners with two equivalent S(5)K2Sn2 trigonal pyramids, and  an edgeedge with one S(4)K2SnS tetrahedra. The corner-sharing octahedral tilt angles are 79°. In the fourth S site, S(8) is bonded in a 3-coordinate geometry to two equivalent K(2), one Sn(2), and one S(7) atom. In the fifth S site, S(1) is bonded to one K(1), one K(2), one Sn(1), and one Sn(2) atom to form distorted SK2Sn2 trigonal pyramids that share  a cornercorner with one S(3)K2Sn3 square pyramid, corners with three equivalent S(4)K2SnS tetrahedra, corners with two equivalent S(7)K2S2 trigonal pyramids, corners with two equivalent S(5)K2Sn2 trigonal pyramids, corners with four equivalent S(2)K2Sn2 trigonal pyramids, edges with two equivalent S(3)K2Sn3 square pyramids, and  an edgeedge with one S(5)K2Sn2 trigonal pyramid. In the sixth S site, S(2) is bonded to one K(1), one K(2), and two equivalent Sn(1) atoms to form distorted SK2Sn2 trigonal pyramids that share corners with two equivalent S(3)K2Sn3 square pyramids, corners with two equivalent S(4)K2SnS tetrahedra, corners with two equivalent S(7)K2S2 trigonal pyramids, corners with two equivalent S(5)K2Sn2 trigonal pyramids, corners with four equivalent S(1)K2Sn2 trigonal pyramids,  an edgeedge with one S(3)K2Sn3 square pyramid,  an edgeedge with one S(2)K2Sn2 trigonal pyramid, and  an edgeedge with one S(5)K2Sn2 trigonal pyramid. In the seventh S site, S(3) is bonded to one K(1), one K(2), one Sn(1), and two equivalent Sn(2) atoms to form SK2Sn3 square pyramids that share corners with four equivalent S(4)K2SnS tetrahedra,  a cornercorner with one S(1)K2Sn2 trigonal pyramid,  a cornercorner with one S(5)K2Sn2 trigonal pyramid, corners with two equivalent S(7)K2S2 trigonal pyramids, corners with two equivalent S(2)K2Sn2 trigonal pyramids,  an edgeedge with one S(3)K2Sn3 square pyramid,  an edgeedge with one S(2)K2Sn2 trigonal pyramid, edges with two equivalent S(1)K2Sn2 trigonal pyramids, and edges with two equivalent S(5)K2Sn2 trigonal pyramids. In the eighth S site, S(4) is bonded to one K(1), one K(2), one Sn(2), and one S(6) atom to form distorted SK2SnS tetrahedra that share corners with four equivalent S(3)K2Sn3 square pyramids,  a cornercorner with one S(7)K2S2 trigonal pyramid,  a cornercorner with one S(5)K2Sn2 trigonal pyramid, corners with two equivalent S(2)K2Sn2 trigonal pyramids, corners with three equivalent S(1)K2Sn2 trigonal pyramids,  an edgeedge with one S(7)K2S2 trigonal pyramid, and  an edgeedge with one S(5)K2Sn2 trigonal pyramid. is represented by the CIF file [CIF]
data_KSnS4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.065
_cell_length_b   9.658
_cell_length_c   14.613
_cell_angle_alpha   68.707
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1323.485
_cell_formula_units_Z   8
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  0.362  0.856  0.797  1.0
  K  K1  1  0.862  0.144  0.703  1.0
  K  K2  1  0.638  0.144  0.203  1.0
  K  K3  1  0.138  0.856  0.297  1.0
  K  K4  1  0.273  0.373  0.596  1.0
  K  K5  1  0.773  0.627  0.904  1.0
  K  K6  1  0.727  0.627  0.404  1.0
  K  K7  1  0.227  0.373  0.096  1.0
  Sn  Sn8  1  0.173  0.987  0.984  1.0
  Sn  Sn9  1  0.673  0.013  0.516  1.0
  Sn  Sn10  1  0.827  0.013  0.016  1.0
  Sn  Sn11  1  0.327  0.987  0.484  1.0
  Sn  Sn12  1  0.000  0.810  0.595  1.0
  Sn  Sn13  1  0.500  0.190  0.905  1.0
  Sn  Sn14  1  1.000  0.190  0.405  1.0
  Sn  Sn15  1  0.500  0.810  0.095  1.0
  S  S16  1  0.275  0.745  0.036  1.0
  S  S17  1  0.775  0.255  0.464  1.0
  S  S18  1  0.725  0.255  0.964  1.0
  S  S19  1  0.225  0.745  0.536  1.0
  S  S20  1  0.040  0.080  0.086  1.0
  S  S21  1  0.540  0.920  0.414  1.0
  S  S22  1  0.960  0.920  0.914  1.0
  S  S23  1  0.460  0.080  0.586  1.0
  S  S24  1  0.900  0.935  0.423  1.0
  S  S25  1  0.400  0.065  0.077  1.0
  S  S26  1  0.100  0.065  0.577  1.0
  S  S27  1  0.600  0.935  0.923  1.0
  S  S28  1  0.067  0.711  0.779  1.0
  S  S29  1  0.567  0.289  0.721  1.0
  S  S30  1  0.933  0.289  0.221  1.0
  S  S31  1  0.433  0.711  0.279  1.0
  S  S32  1  0.272  0.153  0.834  1.0
  S  S33  1  0.772  0.847  0.666  1.0
  S  S34  1  0.728  0.847  0.166  1.0
  S  S35  1  0.228  0.153  0.334  1.0
  S  S36  1  0.143  0.506  0.804  1.0
  S  S37  1  0.643  0.494  0.696  1.0
  S  S38  1  0.857  0.494  0.196  1.0
  S  S39  1  0.357  0.506  0.304  1.0
  S  S40  1  0.344  0.539  0.772  1.0
  S  S41  1  0.844  0.461  0.728  1.0
  S  S42  1  0.656  0.461  0.228  1.0
  S  S43  1  0.156  0.539  0.272  1.0
  S  S44  1  0.440  0.453  0.903  1.0
  S  S45  1  0.940  0.547  0.597  1.0
  S  S46  1  0.560  0.547  0.097  1.0
  S  S47  1  0.060  0.453  0.403  1.0
[/CIF]
.