The structure described by Y2Zn17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 18-coordinate geometry to six equivalent Zn(3) and twelve equivalent Zn(4) atoms. In the second Y site, Y(2) is bonded in a 20-coordinate geometry to two equivalent Zn(1), six equivalent Zn(2), six equivalent Zn(3), and six equivalent Zn(4) atoms. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 14-coordinate geometry to one Y(2), one Zn(1), three equivalent Zn(2), three equivalent Zn(4), and six equivalent Zn(3) atoms. In the second Zn site, Zn(2) is bonded to two equivalent Y(2), two equivalent Zn(1), four equivalent Zn(3), and four equivalent Zn(4) atoms to form ZnY2Zn10 cuboctahedra that share corners with four equivalent Zn(2)Y2Zn10 cuboctahedra, corners with eight equivalent Zn(3)Y2Zn10 cuboctahedra, corners with ten equivalent Zn(4)Y3Zn9 cuboctahedra, edges with four equivalent Zn(3)Y2Zn10 cuboctahedra, edges with six equivalent Zn(4)Y3Zn9 cuboctahedra, faces with four equivalent Zn(4)Y3Zn9 cuboctahedra, faces with six equivalent Zn(2)Y2Zn10 cuboctahedra, and faces with eight equivalent Zn(3)Y2Zn10 cuboctahedra. In the third Zn site, Zn(3) is bonded to one Y(1), one Y(2), two equivalent Zn(1), two equivalent Zn(2), two equivalent Zn(3), and four equivalent Zn(4) atoms to form distorted ZnY2Zn10 cuboctahedra that share corners with four equivalent Zn(2)Y2Zn10 cuboctahedra, corners with eight equivalent Zn(4)Y3Zn9 cuboctahedra, corners with twelve equivalent Zn(3)Y2Zn10 cuboctahedra,  an edgeedge with one Zn(3)Y2Zn10 cuboctahedra, edges with two equivalent Zn(2)Y2Zn10 cuboctahedra, edges with two equivalent Zn(4)Y3Zn9 cuboctahedra, faces with four equivalent Zn(2)Y2Zn10 cuboctahedra, faces with seven equivalent Zn(3)Y2Zn10 cuboctahedra, and faces with ten equivalent Zn(4)Y3Zn9 cuboctahedra. In the fourth Zn site, Zn(4) is bonded to one Y(2), two equivalent Y(1), one Zn(1), two equivalent Zn(2), two equivalent Zn(4), and four equivalent Zn(3) atoms to form distorted ZnY3Zn9 cuboctahedra that share corners with five equivalent Zn(2)Y2Zn10 cuboctahedra, corners with eight equivalent Zn(3)Y2Zn10 cuboctahedra, corners with ten equivalent Zn(4)Y3Zn9 cuboctahedra, edges with two equivalent Zn(3)Y2Zn10 cuboctahedra, edges with three equivalent Zn(2)Y2Zn10 cuboctahedra, edges with five equivalent Zn(4)Y3Zn9 cuboctahedra, faces with two equivalent Zn(2)Y2Zn10 cuboctahedra, faces with eight equivalent Zn(4)Y3Zn9 cuboctahedra, and faces with ten equivalent Zn(3)Y2Zn10 cuboctahedra. is represented by the CIF file [CIF]
data_Y2Zn17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.026
_cell_length_b   9.026
_cell_length_c   8.697
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   613.657
_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
  Y  Y0  1  0.000  0.000  0.250  1.0
  Y  Y1  1  0.000  0.000  0.750  1.0
  Y  Y2  1  0.333  0.667  0.750  1.0
  Y  Y3  1  0.667  0.333  0.250  1.0
  Zn  Zn4  1  0.333  0.667  0.402  1.0
  Zn  Zn5  1  0.667  0.333  0.598  1.0
  Zn  Zn6  1  0.667  0.333  0.902  1.0
  Zn  Zn7  1  0.333  0.667  0.098  1.0
  Zn  Zn8  1  0.500  0.500  0.500  1.0
  Zn  Zn9  1  0.500  0.000  0.500  1.0
  Zn  Zn10  1  0.000  0.500  0.500  1.0
  Zn  Zn11  1  0.500  0.500  0.000  1.0
  Zn  Zn12  1  0.500  0.000  0.000  1.0
  Zn  Zn13  1  0.000  0.500  0.000  1.0
  Zn  Zn14  1  0.329  0.365  0.250  1.0
  Zn  Zn15  1  0.635  0.964  0.250  1.0
  Zn  Zn16  1  0.036  0.671  0.250  1.0
  Zn  Zn17  1  0.635  0.671  0.250  1.0
  Zn  Zn18  1  0.036  0.365  0.250  1.0
  Zn  Zn19  1  0.329  0.964  0.250  1.0
  Zn  Zn20  1  0.671  0.635  0.750  1.0
  Zn  Zn21  1  0.365  0.036  0.750  1.0
  Zn  Zn22  1  0.964  0.329  0.750  1.0
  Zn  Zn23  1  0.365  0.329  0.750  1.0
  Zn  Zn24  1  0.964  0.635  0.750  1.0
  Zn  Zn25  1  0.671  0.036  0.750  1.0
  Zn  Zn26  1  0.162  0.838  0.519  1.0
  Zn  Zn27  1  0.162  0.323  0.519  1.0
  Zn  Zn28  1  0.677  0.838  0.519  1.0
  Zn  Zn29  1  0.838  0.162  0.481  1.0
  Zn  Zn30  1  0.838  0.677  0.481  1.0
  Zn  Zn31  1  0.323  0.162  0.481  1.0
  Zn  Zn32  1  0.838  0.162  0.019  1.0
  Zn  Zn33  1  0.838  0.677  0.019  1.0
  Zn  Zn34  1  0.323  0.162  0.019  1.0
  Zn  Zn35  1  0.162  0.838  0.981  1.0
  Zn  Zn36  1  0.162  0.323  0.981  1.0
  Zn  Zn37  1  0.677  0.838  0.981  1.0
[/CIF]
.
The structure described by Y2Zn17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 18-coordinate geometry to six equivalent Zn(3) and twelve equivalent Zn(4) atoms. In the second Y site, Y(2) is bonded in a 20-coordinate geometry to two equivalent Zn(1), six equivalent Zn(2), six equivalent Zn(3), and six equivalent Zn(4) atoms. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 14-coordinate geometry to one Y(2), one Zn(1), three equivalent Zn(2), three equivalent Zn(4), and six equivalent Zn(3) atoms. In the second Zn site, Zn(2) is bonded to two equivalent Y(2), two equivalent Zn(1), four equivalent Zn(3), and four equivalent Zn(4) atoms to form ZnY2Zn10 cuboctahedra that share corners with four equivalent Zn(2)Y2Zn10 cuboctahedra, corners with eight equivalent Zn(3)Y2Zn10 cuboctahedra, corners with ten equivalent Zn(4)Y3Zn9 cuboctahedra, edges with four equivalent Zn(3)Y2Zn10 cuboctahedra, edges with six equivalent Zn(4)Y3Zn9 cuboctahedra, faces with four equivalent Zn(4)Y3Zn9 cuboctahedra, faces with six equivalent Zn(2)Y2Zn10 cuboctahedra, and faces with eight equivalent Zn(3)Y2Zn10 cuboctahedra. In the third Zn site, Zn(3) is bonded to one Y(1), one Y(2), two equivalent Zn(1), two equivalent Zn(2), two equivalent Zn(3), and four equivalent Zn(4) atoms to form distorted ZnY2Zn10 cuboctahedra that share corners with four equivalent Zn(2)Y2Zn10 cuboctahedra, corners with eight equivalent Zn(4)Y3Zn9 cuboctahedra, corners with twelve equivalent Zn(3)Y2Zn10 cuboctahedra,  an edgeedge with one Zn(3)Y2Zn10 cuboctahedra, edges with two equivalent Zn(2)Y2Zn10 cuboctahedra, edges with two equivalent Zn(4)Y3Zn9 cuboctahedra, faces with four equivalent Zn(2)Y2Zn10 cuboctahedra, faces with seven equivalent Zn(3)Y2Zn10 cuboctahedra, and faces with ten equivalent Zn(4)Y3Zn9 cuboctahedra. In the fourth Zn site, Zn(4) is bonded to one Y(2), two equivalent Y(1), one Zn(1), two equivalent Zn(2), two equivalent Zn(4), and four equivalent Zn(3) atoms to form distorted ZnY3Zn9 cuboctahedra that share corners with five equivalent Zn(2)Y2Zn10 cuboctahedra, corners with eight equivalent Zn(3)Y2Zn10 cuboctahedra, corners with ten equivalent Zn(4)Y3Zn9 cuboctahedra, edges with two equivalent Zn(3)Y2Zn10 cuboctahedra, edges with three equivalent Zn(2)Y2Zn10 cuboctahedra, edges with five equivalent Zn(4)Y3Zn9 cuboctahedra, faces with two equivalent Zn(2)Y2Zn10 cuboctahedra, faces with eight equivalent Zn(4)Y3Zn9 cuboctahedra, and faces with ten equivalent Zn(3)Y2Zn10 cuboctahedra. is represented by the CIF file [CIF]
data_Y2Zn17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.026
_cell_length_b   9.026
_cell_length_c   8.697
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   613.657
_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
  Y  Y0  1  0.000  0.000  0.250  1.0
  Y  Y1  1  0.000  0.000  0.750  1.0
  Y  Y2  1  0.333  0.667  0.750  1.0
  Y  Y3  1  0.667  0.333  0.250  1.0
  Zn  Zn4  1  0.333  0.667  0.402  1.0
  Zn  Zn5  1  0.667  0.333  0.598  1.0
  Zn  Zn6  1  0.667  0.333  0.902  1.0
  Zn  Zn7  1  0.333  0.667  0.098  1.0
  Zn  Zn8  1  0.500  0.500  0.500  1.0
  Zn  Zn9  1  0.500  0.000  0.500  1.0
  Zn  Zn10  1  0.000  0.500  0.500  1.0
  Zn  Zn11  1  0.500  0.500  0.000  1.0
  Zn  Zn12  1  0.500  0.000  0.000  1.0
  Zn  Zn13  1  0.000  0.500  0.000  1.0
  Zn  Zn14  1  0.329  0.365  0.250  1.0
  Zn  Zn15  1  0.635  0.964  0.250  1.0
  Zn  Zn16  1  0.036  0.671  0.250  1.0
  Zn  Zn17  1  0.635  0.671  0.250  1.0
  Zn  Zn18  1  0.036  0.365  0.250  1.0
  Zn  Zn19  1  0.329  0.964  0.250  1.0
  Zn  Zn20  1  0.671  0.635  0.750  1.0
  Zn  Zn21  1  0.365  0.036  0.750  1.0
  Zn  Zn22  1  0.964  0.329  0.750  1.0
  Zn  Zn23  1  0.365  0.329  0.750  1.0
  Zn  Zn24  1  0.964  0.635  0.750  1.0
  Zn  Zn25  1  0.671  0.036  0.750  1.0
  Zn  Zn26  1  0.162  0.838  0.519  1.0
  Zn  Zn27  1  0.162  0.323  0.519  1.0
  Zn  Zn28  1  0.677  0.838  0.519  1.0
  Zn  Zn29  1  0.838  0.162  0.481  1.0
  Zn  Zn30  1  0.838  0.677  0.481  1.0
  Zn  Zn31  1  0.323  0.162  0.481  1.0
  Zn  Zn32  1  0.838  0.162  0.019  1.0
  Zn  Zn33  1  0.838  0.677  0.019  1.0
  Zn  Zn34  1  0.323  0.162  0.019  1.0
  Zn  Zn35  1  0.162  0.838  0.981  1.0
  Zn  Zn36  1  0.162  0.323  0.981  1.0
  Zn  Zn37  1  0.677  0.838  0.981  1.0
[/CIF]
.