The compound described by Zn2SiO4 crystallizes in the trigonal R-3 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(4), and two equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, and corners with four equivalent Si(1)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(3) is bonded in a trigonal planar geometry to two equivalent Zn(2) and one Si(1) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one Si(1) atom. In the third O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one Si(1) atom. In the fourth O site, O(2) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zn2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.635
_cell_length_b   8.635
_cell_length_c   8.635
_cell_angle_alpha   107.863
_cell_angle_beta   107.863
_cell_angle_gamma   107.863
_symmetry_Int_Tables_number   1
_cell_volume   523.073
_cell_formula_units_Z   6
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  0.610  0.439  0.205  1.0
  Zn  Zn1  1  0.205  0.610  0.439  1.0
  Zn  Zn2  1  0.439  0.205  0.610  1.0
  Zn  Zn3  1  0.390  0.561  0.795  1.0
  Zn  Zn4  1  0.795  0.390  0.561  1.0
  Zn  Zn5  1  0.561  0.795  0.390  1.0
  Zn  Zn6  1  0.900  0.125  0.722  1.0
  Zn  Zn7  1  0.125  0.722  0.900  1.0
  Zn  Zn8  1  0.722  0.900  0.125  1.0
  Zn  Zn9  1  0.100  0.875  0.278  1.0
  Zn  Zn10  1  0.875  0.278  0.100  1.0
  Zn  Zn11  1  0.278  0.100  0.875  1.0
  Si  Si12  1  0.235  0.460  0.053  1.0
  Si  Si13  1  0.460  0.053  0.235  1.0
  Si  Si14  1  0.053  0.235  0.460  1.0
  Si  Si15  1  0.765  0.540  0.947  1.0
  Si  Si16  1  0.540  0.947  0.765  1.0
  Si  Si17  1  0.947  0.765  0.540  1.0
  O  O18  1  0.361  0.354  0.034  1.0
  O  O19  1  0.034  0.361  0.354  1.0
  O  O20  1  0.354  0.034  0.361  1.0
  O  O21  1  0.639  0.646  0.966  1.0
  O  O22  1  0.966  0.639  0.646  1.0
  O  O23  1  0.646  0.966  0.639  1.0
  O  O24  1  0.733  0.688  0.400  1.0
  O  O25  1  0.400  0.733  0.688  1.0
  O  O26  1  0.688  0.400  0.733  1.0
  O  O27  1  0.267  0.312  0.600  1.0
  O  O28  1  0.600  0.267  0.312  1.0
  O  O29  1  0.312  0.600  0.267  1.0
  O  O30  1  0.026  0.973  0.691  1.0
  O  O31  1  0.691  0.026  0.973  1.0
  O  O32  1  0.973  0.691  0.026  1.0
  O  O33  1  0.974  0.027  0.309  1.0
  O  O34  1  0.309  0.974  0.027  1.0
  O  O35  1  0.027  0.309  0.974  1.0
  O  O36  1  0.249  0.573  0.933  1.0
  O  O37  1  0.573  0.933  0.249  1.0
  O  O38  1  0.933  0.249  0.573  1.0
  O  O39  1  0.751  0.427  0.067  1.0
  O  O40  1  0.427  0.067  0.751  1.0
  O  O41  1  0.067  0.751  0.427  1.0
[/CIF]
.
The compound described by Zn2SiO4 crystallizes in the trigonal R-3 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(4), and two equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(1), one O(4), and two equivalent O(3) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, and corners with four equivalent Si(1)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(3) is bonded in a trigonal planar geometry to two equivalent Zn(2) and one Si(1) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one Si(1) atom. In the third O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one Si(1) atom. In the fourth O site, O(2) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zn2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.635
_cell_length_b   8.635
_cell_length_c   8.635
_cell_angle_alpha   107.863
_cell_angle_beta   107.863
_cell_angle_gamma   107.863
_symmetry_Int_Tables_number   1
_cell_volume   523.073
_cell_formula_units_Z   6
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  0.610  0.439  0.205  1.0
  Zn  Zn1  1  0.205  0.610  0.439  1.0
  Zn  Zn2  1  0.439  0.205  0.610  1.0
  Zn  Zn3  1  0.390  0.561  0.795  1.0
  Zn  Zn4  1  0.795  0.390  0.561  1.0
  Zn  Zn5  1  0.561  0.795  0.390  1.0
  Zn  Zn6  1  0.900  0.125  0.722  1.0
  Zn  Zn7  1  0.125  0.722  0.900  1.0
  Zn  Zn8  1  0.722  0.900  0.125  1.0
  Zn  Zn9  1  0.100  0.875  0.278  1.0
  Zn  Zn10  1  0.875  0.278  0.100  1.0
  Zn  Zn11  1  0.278  0.100  0.875  1.0
  Si  Si12  1  0.235  0.460  0.053  1.0
  Si  Si13  1  0.460  0.053  0.235  1.0
  Si  Si14  1  0.053  0.235  0.460  1.0
  Si  Si15  1  0.765  0.540  0.947  1.0
  Si  Si16  1  0.540  0.947  0.765  1.0
  Si  Si17  1  0.947  0.765  0.540  1.0
  O  O18  1  0.361  0.354  0.034  1.0
  O  O19  1  0.034  0.361  0.354  1.0
  O  O20  1  0.354  0.034  0.361  1.0
  O  O21  1  0.639  0.646  0.966  1.0
  O  O22  1  0.966  0.639  0.646  1.0
  O  O23  1  0.646  0.966  0.639  1.0
  O  O24  1  0.733  0.688  0.400  1.0
  O  O25  1  0.400  0.733  0.688  1.0
  O  O26  1  0.688  0.400  0.733  1.0
  O  O27  1  0.267  0.312  0.600  1.0
  O  O28  1  0.600  0.267  0.312  1.0
  O  O29  1  0.312  0.600  0.267  1.0
  O  O30  1  0.026  0.973  0.691  1.0
  O  O31  1  0.691  0.026  0.973  1.0
  O  O32  1  0.973  0.691  0.026  1.0
  O  O33  1  0.974  0.027  0.309  1.0
  O  O34  1  0.309  0.974  0.027  1.0
  O  O35  1  0.027  0.309  0.974  1.0
  O  O36  1  0.249  0.573  0.933  1.0
  O  O37  1  0.573  0.933  0.249  1.0
  O  O38  1  0.933  0.249  0.573  1.0
  O  O39  1  0.751  0.427  0.067  1.0
  O  O40  1  0.427  0.067  0.751  1.0
  O  O41  1  0.067  0.751  0.427  1.0
[/CIF]
.