Zn2SiO4 crystallizes in the orthorhombic Imma space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form ZnO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra, edges with two equivalent Zn(2)O6 octahedra, and edges with four equivalent Zn(3)O6 octahedra. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), and four equivalent O(4) atoms to form ZnO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra, edges with two equivalent Zn(1)O6 octahedra, and edges with four equivalent Zn(3)O6 octahedra. In the third Zn site, Zn(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form ZnO6 octahedra that share corners with two equivalent Zn(3)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, edges with two equivalent Zn(1)O6 octahedra, edges with two equivalent Zn(2)O6 octahedra, and edges with three equivalent Zn(3)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. Si(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with three equivalent Zn(1)O6 octahedra, corners with three equivalent Zn(2)O6 octahedra, corners with four equivalent Zn(3)O6 octahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-61°. There are four inequivalent O sites. In the first O site, O(4) is bonded in a rectangular see-saw-like geometry to one Zn(1), one Zn(2), one Zn(3), and one Si(1) atom. In the second O site, O(1) is bonded to one Zn(2) and four equivalent Zn(3) atoms to form edge-sharing OZn5 square pyramids. In the third O site, O(2) is bonded in a trigonal planar geometry to one Zn(2) and two equivalent Si(1) atoms. In the fourth O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Zn(1), two equivalent Zn(3), and one Si(1) atom.
Zn2SiO4 crystallizes in the orthorhombic Imma space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form ZnO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra, edges with two equivalent Zn(2)O6 octahedra, and edges with four equivalent Zn(3)O6 octahedra. Both Zn(1)-O(3) bond lengths are 2.19 Å. All Zn(1)-O(4) bond lengths are 2.10 Å. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), and four equivalent O(4) atoms to form ZnO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra, edges with two equivalent Zn(1)O6 octahedra, and edges with four equivalent Zn(3)O6 octahedra. The Zn(2)-O(1) bond length is 2.08 Å. The Zn(2)-O(2) bond length is 2.17 Å. All Zn(2)-O(4) bond lengths are 2.14 Å. In the third Zn site, Zn(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form ZnO6 octahedra that share corners with two equivalent Zn(3)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, edges with two equivalent Zn(1)O6 octahedra, edges with two equivalent Zn(2)O6 octahedra, and edges with three equivalent Zn(3)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. Both Zn(3)-O(1) bond lengths are 2.08 Å. Both Zn(3)-O(3) bond lengths are 2.17 Å. Both Zn(3)-O(4) bond lengths are 2.20 Å. Si(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with three equivalent Zn(1)O6 octahedra, corners with three equivalent Zn(2)O6 octahedra, corners with four equivalent Zn(3)O6 octahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-61°. The Si(1)-O(2) bond length is 1.72 Å. The Si(1)-O(3) bond length is 1.65 Å. Both Si(1)-O(4) bond lengths are 1.65 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a rectangular see-saw-like geometry to one Zn(1), one Zn(2), one Zn(3), and one Si(1) atom. In the second O site, O(1) is bonded to one Zn(2) and four equivalent Zn(3) atoms to form edge-sharing OZn5 square pyramids. In the third O site, O(2) is bonded in a trigonal planar geometry to one Zn(2) and two equivalent Si(1) atoms. In the fourth O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Zn(1), two equivalent Zn(3), and one Si(1) atom.