The structure described by K2Sb4S7O crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one S(1), one S(5), one S(6), two equivalent S(2), two equivalent S(7), and two equivalent O(1) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one S(2), one S(3), one S(5), one S(6), and two equivalent S(4) atoms. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one S(3), one S(4), one S(5), and two equivalent S(6) atoms to form distorted edge-sharing SbS5 square pyramids. In the second Sb site, Sb(2) is bonded in a 3-coordinate geometry to one S(1), one S(2), one S(3), and one S(5) atom. In the third Sb site, Sb(3) is bonded in a rectangular see-saw-like geometry to one S(2), one S(3), one S(4), and one S(6) atom. In the fourth Sb site, Sb(4) is bonded in a see-saw-like geometry to one S(1), one S(3), and two equivalent S(7) atoms. There are seven inequivalent S sites. In the first S site, S(1) is bonded in a distorted water-like geometry to one K(1), one Sb(2), and one Sb(4) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(1), one Sb(2), and one Sb(3) atom. In the third S site, S(3) is bonded in a 5-coordinate geometry to one K(2), one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. In the fourth S site, S(4) is bonded to two equivalent K(2), one Sb(1), and one Sb(3) atom to form SK2Sb2 trigonal pyramids that share  a cornercorner with one S(6)K2Sb3 square pyramid, edges with two equivalent S(6)K2Sb3 square pyramids, and  an edgeedge with one S(4)K2Sb2 trigonal pyramid. In the fifth S site, S(5) is bonded in a see-saw-like geometry to one K(1), one K(2), one Sb(1), and one Sb(2) atom. In the sixth S site, S(6) is bonded to one K(1), one K(2), one Sb(3), and two equivalent Sb(1) atoms to form distorted SK2Sb3 square pyramids that share  a cornercorner with one S(4)K2Sb2 trigonal pyramid,  an edgeedge with one S(6)K2Sb3 square pyramid, and edges with two equivalent S(4)K2Sb2 trigonal pyramids. In the seventh S site, S(7) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Sb(4) atoms. O(1) is bonded in a water-like geometry to two equivalent K(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Sb4S7O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.327
_cell_length_b   9.641
_cell_length_c   11.635
_cell_angle_alpha   79.359
_cell_angle_beta   86.336
_cell_angle_gamma   77.610
_symmetry_Int_Tables_number   1
_cell_volume   788.710
_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  1  0.415  0.299  0.561  1.0
  K  K1  1  0.585  0.701  0.439  1.0
  K  K2  1  0.710  0.346  0.893  1.0
  K  K3  1  0.290  0.654  0.107  1.0
  Sb  Sb4  1  0.259  0.128  0.954  1.0
  Sb  Sb5  1  0.741  0.872  0.046  1.0
  Sb  Sb6  1  0.140  0.561  0.813  1.0
  Sb  Sb7  1  0.860  0.439  0.187  1.0
  Sb  Sb8  1  0.498  0.818  0.768  1.0
  Sb  Sb9  1  0.502  0.182  0.232  1.0
  Sb  Sb10  1  0.956  0.952  0.655  1.0
  Sb  Sb11  1  0.044  0.048  0.345  1.0
  S  S12  1  0.954  0.695  0.640  1.0
  S  S13  1  0.046  0.305  0.360  1.0
  S  S14  1  0.447  0.574  0.713  1.0
  S  S15  1  0.553  0.426  0.287  1.0
  S  S16  1  0.181  0.868  0.855  1.0
  S  S17  1  0.819  0.132  0.145  1.0
  S  S18  1  0.667  0.674  0.948  1.0
  S  S19  1  0.333  0.326  0.052  1.0
  S  S20  1  0.112  0.323  0.774  1.0
  S  S21  1  0.888  0.677  0.226  1.0
  S  S22  1  0.558  0.074  0.849  1.0
  S  S23  1  0.442  0.926  0.151  1.0
  S  S24  1  0.238  0.988  0.540  1.0
  S  S25  1  0.762  0.012  0.460  1.0
  O  O26  1  0.737  0.414  0.536  1.0
  O  O27  1  0.263  0.586  0.464  1.0
[/CIF]
.
The structure described by K2Sb4S7O crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one S(1), one S(5), one S(6), two equivalent S(2), two equivalent S(7), and two equivalent O(1) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one S(2), one S(3), one S(5), one S(6), and two equivalent S(4) atoms. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one S(3), one S(4), one S(5), and two equivalent S(6) atoms to form distorted edge-sharing SbS5 square pyramids. In the second Sb site, Sb(2) is bonded in a 3-coordinate geometry to one S(1), one S(2), one S(3), and one S(5) atom. In the third Sb site, Sb(3) is bonded in a rectangular see-saw-like geometry to one S(2), one S(3), one S(4), and one S(6) atom. In the fourth Sb site, Sb(4) is bonded in a see-saw-like geometry to one S(1), one S(3), and two equivalent S(7) atoms. There are seven inequivalent S sites. In the first S site, S(1) is bonded in a distorted water-like geometry to one K(1), one Sb(2), and one Sb(4) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(1), one Sb(2), and one Sb(3) atom. In the third S site, S(3) is bonded in a 5-coordinate geometry to one K(2), one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. In the fourth S site, S(4) is bonded to two equivalent K(2), one Sb(1), and one Sb(3) atom to form SK2Sb2 trigonal pyramids that share  a cornercorner with one S(6)K2Sb3 square pyramid, edges with two equivalent S(6)K2Sb3 square pyramids, and  an edgeedge with one S(4)K2Sb2 trigonal pyramid. In the fifth S site, S(5) is bonded in a see-saw-like geometry to one K(1), one K(2), one Sb(1), and one Sb(2) atom. In the sixth S site, S(6) is bonded to one K(1), one K(2), one Sb(3), and two equivalent Sb(1) atoms to form distorted SK2Sb3 square pyramids that share  a cornercorner with one S(4)K2Sb2 trigonal pyramid,  an edgeedge with one S(6)K2Sb3 square pyramid, and edges with two equivalent S(4)K2Sb2 trigonal pyramids. In the seventh S site, S(7) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Sb(4) atoms. O(1) is bonded in a water-like geometry to two equivalent K(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Sb4S7O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.327
_cell_length_b   9.641
_cell_length_c   11.635
_cell_angle_alpha   79.359
_cell_angle_beta   86.336
_cell_angle_gamma   77.610
_symmetry_Int_Tables_number   1
_cell_volume   788.710
_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  1  0.415  0.299  0.561  1.0
  K  K1  1  0.585  0.701  0.439  1.0
  K  K2  1  0.710  0.346  0.893  1.0
  K  K3  1  0.290  0.654  0.107  1.0
  Sb  Sb4  1  0.259  0.128  0.954  1.0
  Sb  Sb5  1  0.741  0.872  0.046  1.0
  Sb  Sb6  1  0.140  0.561  0.813  1.0
  Sb  Sb7  1  0.860  0.439  0.187  1.0
  Sb  Sb8  1  0.498  0.818  0.768  1.0
  Sb  Sb9  1  0.502  0.182  0.232  1.0
  Sb  Sb10  1  0.956  0.952  0.655  1.0
  Sb  Sb11  1  0.044  0.048  0.345  1.0
  S  S12  1  0.954  0.695  0.640  1.0
  S  S13  1  0.046  0.305  0.360  1.0
  S  S14  1  0.447  0.574  0.713  1.0
  S  S15  1  0.553  0.426  0.287  1.0
  S  S16  1  0.181  0.868  0.855  1.0
  S  S17  1  0.819  0.132  0.145  1.0
  S  S18  1  0.667  0.674  0.948  1.0
  S  S19  1  0.333  0.326  0.052  1.0
  S  S20  1  0.112  0.323  0.774  1.0
  S  S21  1  0.888  0.677  0.226  1.0
  S  S22  1  0.558  0.074  0.849  1.0
  S  S23  1  0.442  0.926  0.151  1.0
  S  S24  1  0.238  0.988  0.540  1.0
  S  S25  1  0.762  0.012  0.460  1.0
  O  O26  1  0.737  0.414  0.536  1.0
  O  O27  1  0.263  0.586  0.464  1.0
[/CIF]
.