The structure described by Zn2SiO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Zn(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(2), one O(4), and two equivalent O(1) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Zn(2)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Zn(1)O4 tetrahedra and corners with four equivalent Zn(2)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Zn(2) and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to two equivalent Zn(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_Zn2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.090
_cell_length_b   5.551
_cell_length_c   9.048
_cell_angle_alpha   58.696
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   347.167
_cell_formula_units_Z   4
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  0.881  0.243  0.902  1.0
  Zn  Zn1  1  0.619  0.243  0.402  1.0
  Zn  Zn2  1  0.119  0.757  0.098  1.0
  Zn  Zn3  1  0.381  0.757  0.598  1.0
  Zn  Zn4  1  0.492  0.859  0.191  1.0
  Zn  Zn5  1  0.008  0.859  0.691  1.0
  Zn  Zn6  1  0.508  0.141  0.809  1.0
  Zn  Zn7  1  0.992  0.141  0.309  1.0
  Si  Si8  1  0.238  0.365  0.960  1.0
  Si  Si9  1  0.262  0.365  0.460  1.0
  Si  Si10  1  0.762  0.635  0.040  1.0
  Si  Si11  1  0.738  0.635  0.540  1.0
  O  O12  1  0.427  0.234  0.995  1.0
  O  O13  1  0.073  0.234  0.495  1.0
  O  O14  1  0.573  0.766  0.005  1.0
  O  O15  1  0.927  0.766  0.505  1.0
  O  O16  1  0.235  0.693  0.791  1.0
  O  O17  1  0.265  0.693  0.291  1.0
  O  O18  1  0.765  0.307  0.209  1.0
  O  O19  1  0.735  0.307  0.709  1.0
  O  O20  1  0.125  0.164  0.915  1.0
  O  O21  1  0.375  0.164  0.415  1.0
  O  O22  1  0.875  0.836  0.085  1.0
  O  O23  1  0.625  0.836  0.585  1.0
  O  O24  1  0.147  0.380  0.119  1.0
  O  O25  1  0.353  0.380  0.619  1.0
  O  O26  1  0.853  0.620  0.881  1.0
  O  O27  1  0.647  0.620  0.381  1.0
[/CIF]
.
The structure described by Zn2SiO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form distorted ZnO4 tetrahedra that share corners with two equivalent Zn(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(2), one O(4), and two equivalent O(1) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Zn(2)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Zn(1)O4 tetrahedra and corners with four equivalent Zn(2)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Zn(2) and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to two equivalent Zn(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_Zn2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.090
_cell_length_b   5.551
_cell_length_c   9.048
_cell_angle_alpha   58.696
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   347.167
_cell_formula_units_Z   4
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  0.881  0.243  0.902  1.0
  Zn  Zn1  1  0.619  0.243  0.402  1.0
  Zn  Zn2  1  0.119  0.757  0.098  1.0
  Zn  Zn3  1  0.381  0.757  0.598  1.0
  Zn  Zn4  1  0.492  0.859  0.191  1.0
  Zn  Zn5  1  0.008  0.859  0.691  1.0
  Zn  Zn6  1  0.508  0.141  0.809  1.0
  Zn  Zn7  1  0.992  0.141  0.309  1.0
  Si  Si8  1  0.238  0.365  0.960  1.0
  Si  Si9  1  0.262  0.365  0.460  1.0
  Si  Si10  1  0.762  0.635  0.040  1.0
  Si  Si11  1  0.738  0.635  0.540  1.0
  O  O12  1  0.427  0.234  0.995  1.0
  O  O13  1  0.073  0.234  0.495  1.0
  O  O14  1  0.573  0.766  0.005  1.0
  O  O15  1  0.927  0.766  0.505  1.0
  O  O16  1  0.235  0.693  0.791  1.0
  O  O17  1  0.265  0.693  0.291  1.0
  O  O18  1  0.765  0.307  0.209  1.0
  O  O19  1  0.735  0.307  0.709  1.0
  O  O20  1  0.125  0.164  0.915  1.0
  O  O21  1  0.375  0.164  0.415  1.0
  O  O22  1  0.875  0.836  0.085  1.0
  O  O23  1  0.625  0.836  0.585  1.0
  O  O24  1  0.147  0.380  0.119  1.0
  O  O25  1  0.353  0.380  0.619  1.0
  O  O26  1  0.853  0.620  0.881  1.0
  O  O27  1  0.647  0.620  0.381  1.0
[/CIF]
.