The crystal structure described by Ho6Pb2Se11 crystallizes in the orthorhombic Cmc2_1 space group. There are six inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to one Se(10), one Se(5), two equivalent Se(1), and two equivalent Se(6) atoms to form a mixture of edge and corner-sharing HoSe6 octahedra. The corner-sharing octahedral tilt angles range from 9-43°. In the second Ho site, Ho(2) is bonded to one Se(11), one Se(5), two equivalent Se(2), and two equivalent Se(7) atoms to form HoSe6 octahedra that share  a cornercorner with one Ho(1)Se6 octahedra, corners with two equivalent Ho(4)Se6 octahedra, corners with two equivalent Ho(6)Se7 pentagonal bipyramids, edges with two equivalent Ho(2)Se6 octahedra, and edges with three equivalent Ho(4)Se6 octahedra. The corner-sharing octahedral tilt angles range from 7-43°. In the third Ho site, Ho(3) is bonded to one Se(1), one Se(3), two equivalent Se(10), and two equivalent Se(6) atoms to form a mixture of edge and corner-sharing HoSe6 octahedra. The corner-sharing octahedral tilt angles range from 9-48°. In the fourth Ho site, Ho(4) is bonded to one Se(2), one Se(4), two equivalent Se(11), and two equivalent Se(7) atoms to form HoSe6 octahedra that share  a cornercorner with one Ho(5)Se6 octahedra, corners with two equivalent Ho(2)Se6 octahedra, corners with four equivalent Ho(6)Se7 pentagonal bipyramids, edges with two equivalent Ho(4)Se6 octahedra, edges with three equivalent Ho(2)Se6 octahedra, and  an edgeedge with one Ho(6)Se7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 7-57°. In the fifth Ho site, Ho(5) is bonded to one Se(3), one Se(4), two equivalent Se(8), and two equivalent Se(9) atoms to form HoSe6 octahedra that share  a cornercorner with one Ho(3)Se6 octahedra,  a cornercorner with one Ho(4)Se6 octahedra, corners with two equivalent Ho(6)Se7 pentagonal bipyramids, edges with two equivalent Ho(5)Se6 octahedra, and edges with three equivalent Ho(6)Se7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-57°. In the sixth Ho site, Ho(6) is bonded to one Se(8), two equivalent Se(11), two equivalent Se(4), and two equivalent Se(9) atoms to form distorted HoSe7 pentagonal bipyramids that share corners with two equivalent Ho(2)Se6 octahedra, corners with two equivalent Ho(5)Se6 octahedra, corners with four equivalent Ho(4)Se6 octahedra,  an edgeedge with one Ho(4)Se6 octahedra, edges with three equivalent Ho(5)Se6 octahedra, and faces with two equivalent Ho(6)Se7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 17-67°. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 4-coordinate geometry to two equivalent Se(1) and two equivalent Se(5) atoms. In the second Pb site, Pb(2) is bonded in a 7-coordinate geometry to one Se(9), two equivalent Se(10), two equivalent Se(3), and two equivalent Se(8) atoms. There are eleven inequivalent Se sites. In the first Se site, Se(1) is bonded in a 3-coordinate geometry to one Ho(3), two equivalent Ho(1), and two equivalent Pb(1) atoms. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to one Ho(4) and two equivalent Ho(2) atoms. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to one Ho(3), one Ho(5), and two equivalent Pb(2) atoms. In the fourth Se site, Se(4) is bonded in a rectangular see-saw-like geometry to one Ho(4), one Ho(5), and two equivalent Ho(6) atoms. In the fifth Se site, Se(5) is bonded in a 4-coordinate geometry to one Ho(1), one Ho(2), and two equivalent Pb(1) atoms. In the sixth Se site, Se(6) is bonded in a rectangular see-saw-like geometry to two equivalent Ho(1) and two equivalent Ho(3) atoms. In the seventh Se site, Se(7) is bonded in a rectangular see-saw-like geometry to two equivalent Ho(2) and two equivalent Ho(4) atoms. In the eighth Se site, Se(8) is bonded in a 3-coordinate geometry to one Ho(6), two equivalent Ho(5), and two equivalent Pb(2) atoms. In the ninth Se site, Se(9) is bonded to two equivalent Ho(5), two equivalent Ho(6), and one Pb(2) atom to form distorted SeHo4Pb trigonal bipyramids that share corners with two equivalent Se(11)Ho5 trigonal bipyramids,  an edgeedge with one Se(11)Ho5 trigonal bipyramid, and edges with two equivalent Se(9)Ho4Pb trigonal bipyramids. In the tenth Se site, Se(10) is bonded in a 3-coordinate geometry to one Ho(1), two equivalent Ho(3), and two equivalent Pb(2) atoms. In the eleventh Se site, Se(11) is bonded to one Ho(2), two equivalent Ho(4), and two equivalent Ho(6) atoms to form distorted SeHo5 trigonal bipyramids that share corners with two equivalent Se(9)Ho4Pb trigonal bipyramids,  an edgeedge with one Se(9)Ho4Pb trigonal bipyramid, and edges with two equivalent Se(11)Ho5 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho6Pb2Se11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.062
_cell_length_b   7.062
_cell_length_c   38.200
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.430
_symmetry_Int_Tables_number   1
_cell_volume   1053.517
_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
  Ho  Ho0  1  0.752  0.248  0.319  1.0
  Ho  Ho1  1  0.245  0.755  0.681  1.0
  Ho  Ho2  1  0.755  0.245  0.181  1.0
  Ho  Ho3  1  0.248  0.752  0.819  1.0
  Ho  Ho4  1  0.974  0.026  0.866  1.0
  Ho  Ho5  1  0.026  0.974  0.133  1.0
  Ho  Ho6  1  0.974  0.026  0.633  1.0
  Ho  Ho7  1  0.026  0.974  0.366  1.0
  Ho  Ho8  1  0.999  0.001  0.501  1.0
  Ho  Ho9  1  0.001  0.999  0.001  1.0
  Ho  Ho10  1  0.269  0.731  0.057  1.0
  Ho  Ho11  1  0.731  0.269  0.557  1.0
  Pb  Pb12  1  0.484  0.516  0.251  1.0
  Pb  Pb13  1  0.516  0.484  0.751  1.0
  Pb  Pb14  1  0.727  0.273  0.942  1.0
  Pb  Pb15  1  0.273  0.727  0.442  1.0
  Se  Se16  1  0.879  0.121  0.799  1.0
  Se  Se17  1  0.122  0.878  0.198  1.0
  Se  Se18  1  0.878  0.122  0.698  1.0
  Se  Se19  1  0.121  0.879  0.299  1.0
  Se  Se20  1  0.928  0.072  0.432  1.0
  Se  Se21  1  0.088  0.912  0.570  1.0
  Se  Se22  1  0.912  0.088  0.070  1.0
  Se  Se23  1  0.072  0.928  0.932  1.0
  Se  Se24  1  0.831  0.169  0.249  1.0
  Se  Se25  1  0.169  0.831  0.749  1.0
  Se  Se26  1  0.396  0.604  0.337  1.0
  Se  Se27  1  0.603  0.397  0.661  1.0
  Se  Se28  1  0.397  0.603  0.161  1.0
  Se  Se29  1  0.604  0.396  0.837  1.0
  Se  Se30  1  0.638  0.362  0.489  1.0
  Se  Se31  1  0.352  0.648  0.518  1.0
  Se  Se32  1  0.648  0.352  0.018  1.0
  Se  Se33  1  0.362  0.638  0.989  1.0
  Se  Se34  1  0.658  0.342  0.386  1.0
  Se  Se35  1  0.337  0.663  0.611  1.0
  Se  Se36  1  0.663  0.337  0.111  1.0
  Se  Se37  1  0.342  0.658  0.886  1.0
[/CIF]
.
The crystal structure described by Ho6Pb2Se11 crystallizes in the orthorhombic Cmc2_1 space group. There are six inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to one Se(10), one Se(5), two equivalent Se(1), and two equivalent Se(6) atoms to form a mixture of edge and corner-sharing HoSe6 octahedra. The corner-sharing octahedral tilt angles range from 9-43°. In the second Ho site, Ho(2) is bonded to one Se(11), one Se(5), two equivalent Se(2), and two equivalent Se(7) atoms to form HoSe6 octahedra that share  a cornercorner with one Ho(1)Se6 octahedra, corners with two equivalent Ho(4)Se6 octahedra, corners with two equivalent Ho(6)Se7 pentagonal bipyramids, edges with two equivalent Ho(2)Se6 octahedra, and edges with three equivalent Ho(4)Se6 octahedra. The corner-sharing octahedral tilt angles range from 7-43°. In the third Ho site, Ho(3) is bonded to one Se(1), one Se(3), two equivalent Se(10), and two equivalent Se(6) atoms to form a mixture of edge and corner-sharing HoSe6 octahedra. The corner-sharing octahedral tilt angles range from 9-48°. In the fourth Ho site, Ho(4) is bonded to one Se(2), one Se(4), two equivalent Se(11), and two equivalent Se(7) atoms to form HoSe6 octahedra that share  a cornercorner with one Ho(5)Se6 octahedra, corners with two equivalent Ho(2)Se6 octahedra, corners with four equivalent Ho(6)Se7 pentagonal bipyramids, edges with two equivalent Ho(4)Se6 octahedra, edges with three equivalent Ho(2)Se6 octahedra, and  an edgeedge with one Ho(6)Se7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 7-57°. In the fifth Ho site, Ho(5) is bonded to one Se(3), one Se(4), two equivalent Se(8), and two equivalent Se(9) atoms to form HoSe6 octahedra that share  a cornercorner with one Ho(3)Se6 octahedra,  a cornercorner with one Ho(4)Se6 octahedra, corners with two equivalent Ho(6)Se7 pentagonal bipyramids, edges with two equivalent Ho(5)Se6 octahedra, and edges with three equivalent Ho(6)Se7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 48-57°. In the sixth Ho site, Ho(6) is bonded to one Se(8), two equivalent Se(11), two equivalent Se(4), and two equivalent Se(9) atoms to form distorted HoSe7 pentagonal bipyramids that share corners with two equivalent Ho(2)Se6 octahedra, corners with two equivalent Ho(5)Se6 octahedra, corners with four equivalent Ho(4)Se6 octahedra,  an edgeedge with one Ho(4)Se6 octahedra, edges with three equivalent Ho(5)Se6 octahedra, and faces with two equivalent Ho(6)Se7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 17-67°. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 4-coordinate geometry to two equivalent Se(1) and two equivalent Se(5) atoms. In the second Pb site, Pb(2) is bonded in a 7-coordinate geometry to one Se(9), two equivalent Se(10), two equivalent Se(3), and two equivalent Se(8) atoms. There are eleven inequivalent Se sites. In the first Se site, Se(1) is bonded in a 3-coordinate geometry to one Ho(3), two equivalent Ho(1), and two equivalent Pb(1) atoms. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to one Ho(4) and two equivalent Ho(2) atoms. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to one Ho(3), one Ho(5), and two equivalent Pb(2) atoms. In the fourth Se site, Se(4) is bonded in a rectangular see-saw-like geometry to one Ho(4), one Ho(5), and two equivalent Ho(6) atoms. In the fifth Se site, Se(5) is bonded in a 4-coordinate geometry to one Ho(1), one Ho(2), and two equivalent Pb(1) atoms. In the sixth Se site, Se(6) is bonded in a rectangular see-saw-like geometry to two equivalent Ho(1) and two equivalent Ho(3) atoms. In the seventh Se site, Se(7) is bonded in a rectangular see-saw-like geometry to two equivalent Ho(2) and two equivalent Ho(4) atoms. In the eighth Se site, Se(8) is bonded in a 3-coordinate geometry to one Ho(6), two equivalent Ho(5), and two equivalent Pb(2) atoms. In the ninth Se site, Se(9) is bonded to two equivalent Ho(5), two equivalent Ho(6), and one Pb(2) atom to form distorted SeHo4Pb trigonal bipyramids that share corners with two equivalent Se(11)Ho5 trigonal bipyramids,  an edgeedge with one Se(11)Ho5 trigonal bipyramid, and edges with two equivalent Se(9)Ho4Pb trigonal bipyramids. In the tenth Se site, Se(10) is bonded in a 3-coordinate geometry to one Ho(1), two equivalent Ho(3), and two equivalent Pb(2) atoms. In the eleventh Se site, Se(11) is bonded to one Ho(2), two equivalent Ho(4), and two equivalent Ho(6) atoms to form distorted SeHo5 trigonal bipyramids that share corners with two equivalent Se(9)Ho4Pb trigonal bipyramids,  an edgeedge with one Se(9)Ho4Pb trigonal bipyramid, and edges with two equivalent Se(11)Ho5 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho6Pb2Se11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.062
_cell_length_b   7.062
_cell_length_c   38.200
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.430
_symmetry_Int_Tables_number   1
_cell_volume   1053.517
_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
  Ho  Ho0  1  0.752  0.248  0.319  1.0
  Ho  Ho1  1  0.245  0.755  0.681  1.0
  Ho  Ho2  1  0.755  0.245  0.181  1.0
  Ho  Ho3  1  0.248  0.752  0.819  1.0
  Ho  Ho4  1  0.974  0.026  0.866  1.0
  Ho  Ho5  1  0.026  0.974  0.133  1.0
  Ho  Ho6  1  0.974  0.026  0.633  1.0
  Ho  Ho7  1  0.026  0.974  0.366  1.0
  Ho  Ho8  1  0.999  0.001  0.501  1.0
  Ho  Ho9  1  0.001  0.999  0.001  1.0
  Ho  Ho10  1  0.269  0.731  0.057  1.0
  Ho  Ho11  1  0.731  0.269  0.557  1.0
  Pb  Pb12  1  0.484  0.516  0.251  1.0
  Pb  Pb13  1  0.516  0.484  0.751  1.0
  Pb  Pb14  1  0.727  0.273  0.942  1.0
  Pb  Pb15  1  0.273  0.727  0.442  1.0
  Se  Se16  1  0.879  0.121  0.799  1.0
  Se  Se17  1  0.122  0.878  0.198  1.0
  Se  Se18  1  0.878  0.122  0.698  1.0
  Se  Se19  1  0.121  0.879  0.299  1.0
  Se  Se20  1  0.928  0.072  0.432  1.0
  Se  Se21  1  0.088  0.912  0.570  1.0
  Se  Se22  1  0.912  0.088  0.070  1.0
  Se  Se23  1  0.072  0.928  0.932  1.0
  Se  Se24  1  0.831  0.169  0.249  1.0
  Se  Se25  1  0.169  0.831  0.749  1.0
  Se  Se26  1  0.396  0.604  0.337  1.0
  Se  Se27  1  0.603  0.397  0.661  1.0
  Se  Se28  1  0.397  0.603  0.161  1.0
  Se  Se29  1  0.604  0.396  0.837  1.0
  Se  Se30  1  0.638  0.362  0.489  1.0
  Se  Se31  1  0.352  0.648  0.518  1.0
  Se  Se32  1  0.648  0.352  0.018  1.0
  Se  Se33  1  0.362  0.638  0.989  1.0
  Se  Se34  1  0.658  0.342  0.386  1.0
  Se  Se35  1  0.337  0.663  0.611  1.0
  Se  Se36  1  0.663  0.337  0.111  1.0
  Se  Se37  1  0.342  0.658  0.886  1.0
[/CIF]
.