Ni2SiO4 is Spinel-like structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form NiO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with four equivalent Ni(2)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, edges with two equivalent Ni(2)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-61°. In the second Ni site, Ni(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Ni(1)O6 octahedra, edges with two equivalent Ni(2)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-61°. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with two equivalent Ni(2)O6 octahedra, corners with four equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and edges with two equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-60°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ni(2), two equivalent Ni(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ni(1), two equivalent Ni(2), and one Si(1) atom. In the third O site, O(3) is bonded to one Ni(1), two equivalent Ni(2), and one Si(1) atom to form distorted corner-sharing OSiNi3 trigonal pyramids.
Ni2SiO4 is Spinel-like structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form NiO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with four equivalent Ni(2)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, edges with two equivalent Ni(2)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-61°. The Ni(1)-O(2) bond length is 2.03 Å. The Ni(1)-O(3) bond length is 2.10 Å. There are two shorter (2.05 Å) and two longer (2.17 Å) Ni(1)-O(1) bond lengths. In the second Ni site, Ni(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Ni(1)O6 octahedra, edges with two equivalent Ni(2)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-61°. Both Ni(2)-O(1) bond lengths are 2.11 Å. Both Ni(2)-O(2) bond lengths are 2.07 Å. Both Ni(2)-O(3) bond lengths are 2.06 Å. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with two equivalent Ni(2)O6 octahedra, corners with four equivalent Ni(1)O6 octahedra,  an edgeedge with one Ni(1)O6 octahedra, and edges with two equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-60°. The Si(1)-O(2) bond length is 1.66 Å. The Si(1)-O(3) bond length is 1.62 Å. Both Si(1)-O(1) bond lengths are 1.64 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ni(2), two equivalent Ni(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ni(1), two equivalent Ni(2), and one Si(1) atom. In the third O site, O(3) is bonded to one Ni(1), two equivalent Ni(2), and one Si(1) atom to form distorted corner-sharing OSiNi3 trigonal pyramids.