The structure described by NbZn16 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the orthorhombic Cmcm space group. Nb(1) is bonded in a 15-coordinate geometry to one Zn(7), two equivalent Zn(4), two equivalent Zn(5), two equivalent Zn(6), four equivalent Zn(1), and four equivalent Zn(2) atoms. There are seven inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 12-coordinate geometry to one Nb(1), one Zn(4), one Zn(5), one Zn(6), one Zn(7), two equivalent Zn(1), two equivalent Zn(3), and three equivalent Zn(2) atoms. In the second Zn site, Zn(2) is bonded in a 13-coordinate geometry to one Nb(1), one Zn(4), one Zn(6), one Zn(7), two equivalent Zn(2), two equivalent Zn(3), two equivalent Zn(5), and three equivalent Zn(1) atoms. In the third Zn site, Zn(3) is bonded to one Zn(3), one Zn(5), two equivalent Zn(4), four equivalent Zn(1), and four equivalent Zn(2) atoms to form distorted ZnZn12 cuboctahedra that share edges with three equivalent Zn(3)Zn12 cuboctahedra,  a faceface with one Zn(3)Zn12 cuboctahedra, and faces with three equivalent Zn(6)Nb2Zn10 cuboctahedra. In the fourth Zn site, Zn(4) is bonded in a 11-coordinate geometry to one Nb(1), one Zn(4), one Zn(7), two equivalent Zn(1), two equivalent Zn(2), two equivalent Zn(3), and two equivalent Zn(5) atoms. In the fifth Zn site, Zn(5) is bonded in a 10-coordinate geometry to one Nb(1), one Zn(3), one Zn(5), one Zn(6), two equivalent Zn(1), two equivalent Zn(4), and four equivalent Zn(2) atoms. In the sixth Zn site, Zn(6) is bonded to two equivalent Nb(1), two equivalent Zn(5), four equivalent Zn(1), and four equivalent Zn(2) atoms to form ZnNb2Zn10 cuboctahedra that share corners with two equivalent Zn(6)Nb2Zn10 cuboctahedra and faces with six equivalent Zn(3)Zn12 cuboctahedra. In the seventh Zn site, Zn(7) is bonded in a 11-coordinate geometry to one Nb(1), two equivalent Zn(4), four equivalent Zn(1), and four equivalent Zn(2) atoms. is represented by the CIF card [CIF]
data_NbZn16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.810
_cell_length_b   6.810
_cell_length_c   11.510
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   111.976
_symmetry_Int_Tables_number   1
_cell_volume   495.026
_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
  Nb  Nb0  1  0.048  0.952  0.750  1.0
  Nb  Nb1  1  0.952  0.048  0.250  1.0
  Zn  Zn2  1  0.754  0.650  0.366  1.0
  Zn  Zn3  1  0.355  0.982  0.931  1.0
  Zn  Zn4  1  0.620  0.380  0.967  1.0
  Zn  Zn5  1  0.018  0.645  0.569  1.0
  Zn  Zn6  1  0.191  0.482  0.250  1.0
  Zn  Zn7  1  0.650  0.754  0.866  1.0
  Zn  Zn8  1  0.380  0.620  0.467  1.0
  Zn  Zn9  1  0.350  0.246  0.134  1.0
  Zn  Zn10  1  0.176  0.824  0.360  1.0
  Zn  Zn11  1  0.982  0.355  0.069  1.0
  Zn  Zn12  1  0.246  0.350  0.866  1.0
  Zn  Zn13  1  0.645  0.018  0.431  1.0
  Zn  Zn14  1  0.809  0.518  0.750  1.0
  Zn  Zn15  1  0.246  0.350  0.634  1.0
  Zn  Zn16  1  0.380  0.620  0.033  1.0
  Zn  Zn17  1  0.350  0.246  0.366  1.0
  Zn  Zn18  1  0.754  0.650  0.134  1.0
  Zn  Zn19  1  0.518  0.809  0.250  1.0
  Zn  Zn20  1  0.000  0.000  0.000  1.0
  Zn  Zn21  1  0.620  0.380  0.533  1.0
  Zn  Zn22  1  0.291  0.709  0.750  1.0
  Zn  Zn23  1  0.482  0.191  0.750  1.0
  Zn  Zn24  1  0.645  0.018  0.069  1.0
  Zn  Zn25  1  0.650  0.754  0.634  1.0
  Zn  Zn26  1  0.176  0.824  0.140  1.0
  Zn  Zn27  1  0.018  0.645  0.931  1.0
  Zn  Zn28  1  0.000  0.000  0.500  1.0
  Zn  Zn29  1  0.982  0.355  0.431  1.0
  Zn  Zn30  1  0.355  0.982  0.569  1.0
  Zn  Zn31  1  0.709  0.291  0.250  1.0
  Zn  Zn32  1  0.824  0.176  0.860  1.0
  Zn  Zn33  1  0.824  0.176  0.640  1.0
[/CIF]
.
The structure described by NbZn16 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the orthorhombic Cmcm space group. Nb(1) is bonded in a 15-coordinate geometry to one Zn(7), two equivalent Zn(4), two equivalent Zn(5), two equivalent Zn(6), four equivalent Zn(1), and four equivalent Zn(2) atoms. There are seven inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 12-coordinate geometry to one Nb(1), one Zn(4), one Zn(5), one Zn(6), one Zn(7), two equivalent Zn(1), two equivalent Zn(3), and three equivalent Zn(2) atoms. In the second Zn site, Zn(2) is bonded in a 13-coordinate geometry to one Nb(1), one Zn(4), one Zn(6), one Zn(7), two equivalent Zn(2), two equivalent Zn(3), two equivalent Zn(5), and three equivalent Zn(1) atoms. In the third Zn site, Zn(3) is bonded to one Zn(3), one Zn(5), two equivalent Zn(4), four equivalent Zn(1), and four equivalent Zn(2) atoms to form distorted ZnZn12 cuboctahedra that share edges with three equivalent Zn(3)Zn12 cuboctahedra,  a faceface with one Zn(3)Zn12 cuboctahedra, and faces with three equivalent Zn(6)Nb2Zn10 cuboctahedra. In the fourth Zn site, Zn(4) is bonded in a 11-coordinate geometry to one Nb(1), one Zn(4), one Zn(7), two equivalent Zn(1), two equivalent Zn(2), two equivalent Zn(3), and two equivalent Zn(5) atoms. In the fifth Zn site, Zn(5) is bonded in a 10-coordinate geometry to one Nb(1), one Zn(3), one Zn(5), one Zn(6), two equivalent Zn(1), two equivalent Zn(4), and four equivalent Zn(2) atoms. In the sixth Zn site, Zn(6) is bonded to two equivalent Nb(1), two equivalent Zn(5), four equivalent Zn(1), and four equivalent Zn(2) atoms to form ZnNb2Zn10 cuboctahedra that share corners with two equivalent Zn(6)Nb2Zn10 cuboctahedra and faces with six equivalent Zn(3)Zn12 cuboctahedra. In the seventh Zn site, Zn(7) is bonded in a 11-coordinate geometry to one Nb(1), two equivalent Zn(4), four equivalent Zn(1), and four equivalent Zn(2) atoms. is represented by the CIF card [CIF]
data_NbZn16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.810
_cell_length_b   6.810
_cell_length_c   11.510
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   111.976
_symmetry_Int_Tables_number   1
_cell_volume   495.026
_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
  Nb  Nb0  1  0.048  0.952  0.750  1.0
  Nb  Nb1  1  0.952  0.048  0.250  1.0
  Zn  Zn2  1  0.754  0.650  0.366  1.0
  Zn  Zn3  1  0.355  0.982  0.931  1.0
  Zn  Zn4  1  0.620  0.380  0.967  1.0
  Zn  Zn5  1  0.018  0.645  0.569  1.0
  Zn  Zn6  1  0.191  0.482  0.250  1.0
  Zn  Zn7  1  0.650  0.754  0.866  1.0
  Zn  Zn8  1  0.380  0.620  0.467  1.0
  Zn  Zn9  1  0.350  0.246  0.134  1.0
  Zn  Zn10  1  0.176  0.824  0.360  1.0
  Zn  Zn11  1  0.982  0.355  0.069  1.0
  Zn  Zn12  1  0.246  0.350  0.866  1.0
  Zn  Zn13  1  0.645  0.018  0.431  1.0
  Zn  Zn14  1  0.809  0.518  0.750  1.0
  Zn  Zn15  1  0.246  0.350  0.634  1.0
  Zn  Zn16  1  0.380  0.620  0.033  1.0
  Zn  Zn17  1  0.350  0.246  0.366  1.0
  Zn  Zn18  1  0.754  0.650  0.134  1.0
  Zn  Zn19  1  0.518  0.809  0.250  1.0
  Zn  Zn20  1  0.000  0.000  0.000  1.0
  Zn  Zn21  1  0.620  0.380  0.533  1.0
  Zn  Zn22  1  0.291  0.709  0.750  1.0
  Zn  Zn23  1  0.482  0.191  0.750  1.0
  Zn  Zn24  1  0.645  0.018  0.069  1.0
  Zn  Zn25  1  0.650  0.754  0.634  1.0
  Zn  Zn26  1  0.176  0.824  0.140  1.0
  Zn  Zn27  1  0.018  0.645  0.931  1.0
  Zn  Zn28  1  0.000  0.000  0.500  1.0
  Zn  Zn29  1  0.982  0.355  0.431  1.0
  Zn  Zn30  1  0.355  0.982  0.569  1.0
  Zn  Zn31  1  0.709  0.291  0.250  1.0
  Zn  Zn32  1  0.824  0.176  0.860  1.0
  Zn  Zn33  1  0.824  0.176  0.640  1.0
[/CIF]
.