The material described by Zn3Si4(SbO7)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), and two equivalent O(7) atoms to form ZnO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Zn(2)O4 trigonal pyramid, and  an edgeedge with one Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. In the second Zn site, Zn(2) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted ZnO4 trigonal pyramids that share corners with two equivalent Zn(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Sb(1)O6 octahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Zn(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 66°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted SbO6 octahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Zn(2)O4 trigonal pyramid. In the second Sb site, Sb(2) is bonded in a square co-planar geometry to two equivalent O(2) and two equivalent O(4) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Zn(2), one Si(2), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Si(1), one Sb(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one Si(1) atom. is represented by the CIF file [CIF]
data_Zn3Si4(SbO7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.399
_cell_length_b   9.399
_cell_length_c   10.613
_cell_angle_alpha   60.094
_cell_angle_beta   60.094
_cell_angle_gamma   53.004
_symmetry_Int_Tables_number   1
_cell_volume   621.748
_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
  Zn  Zn0  1  0.015  0.310  0.108  1.0
  Zn  Zn1  1  0.690  0.985  0.392  1.0
  Zn  Zn2  1  0.310  0.015  0.608  1.0
  Zn  Zn3  1  0.419  0.581  0.750  1.0
  Zn  Zn4  1  0.985  0.690  0.892  1.0
  Zn  Zn5  1  0.581  0.419  0.250  1.0
  Si  Si6  1  0.522  0.089  0.712  1.0
  Si  Si7  1  0.089  0.522  0.212  1.0
  Si  Si8  1  0.492  0.267  0.113  1.0
  Si  Si9  1  0.267  0.492  0.613  1.0
  Si  Si10  1  0.911  0.478  0.788  1.0
  Si  Si11  1  0.508  0.733  0.887  1.0
  Si  Si12  1  0.733  0.508  0.387  1.0
  Si  Si13  1  0.478  0.911  0.288  1.0
  Sb  Sb14  1  0.797  0.203  0.750  1.0
  Sb  Sb15  1  0.203  0.797  0.250  1.0
  Sb  Sb16  1  0.000  0.000  0.000  1.0
  Sb  Sb17  1  0.000  0.000  0.500  1.0
  O  O18  1  0.798  0.342  0.317  1.0
  O  O19  1  0.937  0.898  0.399  1.0
  O  O20  1  0.493  0.613  0.063  1.0
  O  O21  1  0.898  0.937  0.899  1.0
  O  O22  1  0.270  0.943  0.321  1.0
  O  O23  1  0.069  0.515  0.631  1.0
  O  O24  1  0.613  0.493  0.563  1.0
  O  O25  1  0.057  0.730  0.179  1.0
  O  O26  1  0.931  0.485  0.369  1.0
  O  O27  1  0.633  0.704  0.262  1.0
  O  O28  1  0.063  0.102  0.601  1.0
  O  O29  1  0.730  0.057  0.679  1.0
  O  O30  1  0.485  0.931  0.869  1.0
  O  O31  1  0.342  0.798  0.817  1.0
  O  O32  1  0.704  0.633  0.762  1.0
  O  O33  1  0.943  0.270  0.821  1.0
  O  O34  1  0.923  0.500  0.925  1.0
  O  O35  1  0.367  0.296  0.738  1.0
  O  O36  1  0.500  0.077  0.575  1.0
  O  O37  1  0.296  0.367  0.238  1.0
  O  O38  1  0.515  0.069  0.131  1.0
  O  O39  1  0.102  0.063  0.101  1.0
  O  O40  1  0.500  0.923  0.425  1.0
  O  O41  1  0.507  0.387  0.937  1.0
  O  O42  1  0.077  0.500  0.075  1.0
  O  O43  1  0.387  0.507  0.437  1.0
  O  O44  1  0.658  0.202  0.183  1.0
  O  O45  1  0.202  0.658  0.683  1.0
[/CIF]
.
The material described by Zn3Si4(SbO7)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), and two equivalent O(7) atoms to form ZnO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Zn(2)O4 trigonal pyramid, and  an edgeedge with one Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. In the second Zn site, Zn(2) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted ZnO4 trigonal pyramids that share corners with two equivalent Zn(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Sb(1)O6 octahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Zn(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles are 66°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted SbO6 octahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Zn(2)O4 trigonal pyramid. In the second Sb site, Sb(2) is bonded in a square co-planar geometry to two equivalent O(2) and two equivalent O(4) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Zn(2), one Si(2), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Si(1), one Sb(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one Si(1) atom. is represented by the CIF file [CIF]
data_Zn3Si4(SbO7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.399
_cell_length_b   9.399
_cell_length_c   10.613
_cell_angle_alpha   60.094
_cell_angle_beta   60.094
_cell_angle_gamma   53.004
_symmetry_Int_Tables_number   1
_cell_volume   621.748
_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
  Zn  Zn0  1  0.015  0.310  0.108  1.0
  Zn  Zn1  1  0.690  0.985  0.392  1.0
  Zn  Zn2  1  0.310  0.015  0.608  1.0
  Zn  Zn3  1  0.419  0.581  0.750  1.0
  Zn  Zn4  1  0.985  0.690  0.892  1.0
  Zn  Zn5  1  0.581  0.419  0.250  1.0
  Si  Si6  1  0.522  0.089  0.712  1.0
  Si  Si7  1  0.089  0.522  0.212  1.0
  Si  Si8  1  0.492  0.267  0.113  1.0
  Si  Si9  1  0.267  0.492  0.613  1.0
  Si  Si10  1  0.911  0.478  0.788  1.0
  Si  Si11  1  0.508  0.733  0.887  1.0
  Si  Si12  1  0.733  0.508  0.387  1.0
  Si  Si13  1  0.478  0.911  0.288  1.0
  Sb  Sb14  1  0.797  0.203  0.750  1.0
  Sb  Sb15  1  0.203  0.797  0.250  1.0
  Sb  Sb16  1  0.000  0.000  0.000  1.0
  Sb  Sb17  1  0.000  0.000  0.500  1.0
  O  O18  1  0.798  0.342  0.317  1.0
  O  O19  1  0.937  0.898  0.399  1.0
  O  O20  1  0.493  0.613  0.063  1.0
  O  O21  1  0.898  0.937  0.899  1.0
  O  O22  1  0.270  0.943  0.321  1.0
  O  O23  1  0.069  0.515  0.631  1.0
  O  O24  1  0.613  0.493  0.563  1.0
  O  O25  1  0.057  0.730  0.179  1.0
  O  O26  1  0.931  0.485  0.369  1.0
  O  O27  1  0.633  0.704  0.262  1.0
  O  O28  1  0.063  0.102  0.601  1.0
  O  O29  1  0.730  0.057  0.679  1.0
  O  O30  1  0.485  0.931  0.869  1.0
  O  O31  1  0.342  0.798  0.817  1.0
  O  O32  1  0.704  0.633  0.762  1.0
  O  O33  1  0.943  0.270  0.821  1.0
  O  O34  1  0.923  0.500  0.925  1.0
  O  O35  1  0.367  0.296  0.738  1.0
  O  O36  1  0.500  0.077  0.575  1.0
  O  O37  1  0.296  0.367  0.238  1.0
  O  O38  1  0.515  0.069  0.131  1.0
  O  O39  1  0.102  0.063  0.101  1.0
  O  O40  1  0.500  0.923  0.425  1.0
  O  O41  1  0.507  0.387  0.937  1.0
  O  O42  1  0.077  0.500  0.075  1.0
  O  O43  1  0.387  0.507  0.437  1.0
  O  O44  1  0.658  0.202  0.183  1.0
  O  O45  1  0.202  0.658  0.683  1.0
[/CIF]
.