MgV2Zn2(SiO5)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent V(2)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, edges with two equivalent Zn(1)O5 trigonal bipyramids, and faces with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. There are two inequivalent V sites. In the first V site, V(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form VO6 octahedra that share corners with two equivalent V(2)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, corners with four equivalent Zn(1)O5 trigonal bipyramids, and faces with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. In the second V site, V(2) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form VO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent V(1)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, and edges with four equivalent Zn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 43-50°. Zn(1) is bonded to one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent V(2)O6 octahedra,  an edgeedge with one Si(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 37-62°. 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 two equivalent Mg(1)O6 octahedra, corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, corners with two equivalent Zn(1)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 28-52°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one V(2), two equivalent Zn(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one V(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one V(1), one Zn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one V(2), one Zn(1), and one Si(1) atom. In the fifth O site, O(5) is bonded to one Mg(1), one V(1), one V(2), and one Zn(1) atom to form distorted corner-sharing OMgV2Zn trigonal pyramids.
MgV2Zn2(SiO5)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent V(2)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, edges with two equivalent Zn(1)O5 trigonal bipyramids, and faces with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. Both Mg(1)-O(2) bond lengths are 2.05 Å. Both Mg(1)-O(3) bond lengths are 2.16 Å. Both Mg(1)-O(5) bond lengths are 2.13 Å. There are two inequivalent V sites. In the first V site, V(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form VO6 octahedra that share corners with two equivalent V(2)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, corners with four equivalent Zn(1)O5 trigonal bipyramids, and faces with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. Both V(1)-O(2) bond lengths are 2.04 Å. Both V(1)-O(3) bond lengths are 2.14 Å. Both V(1)-O(5) bond lengths are 2.02 Å. In the second V site, V(2) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form VO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent V(1)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra, and edges with four equivalent Zn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 43-50°. Both V(2)-O(1) bond lengths are 2.13 Å. Both V(2)-O(4) bond lengths are 2.06 Å. Both V(2)-O(5) bond lengths are 2.03 Å. Zn(1) is bonded to one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent V(2)O6 octahedra,  an edgeedge with one Si(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 37-62°. The Zn(1)-O(3) bond length is 2.35 Å. The Zn(1)-O(4) bond length is 1.97 Å. The Zn(1)-O(5) bond length is 1.93 Å. There is one shorter (2.13 Å) and one longer (2.15 Å) Zn(1)-O(1) bond length. 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 two equivalent Mg(1)O6 octahedra, corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, corners with two equivalent Zn(1)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 28-52°. The Si(1)-O(1) bond length is 1.66 Å. The Si(1)-O(2) bond length is 1.63 Å. The Si(1)-O(3) bond length is 1.66 Å. The Si(1)-O(4) bond length is 1.66 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one V(2), two equivalent Zn(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one V(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one V(1), one Zn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one V(2), one Zn(1), and one Si(1) atom. In the fifth O site, O(5) is bonded to one Mg(1), one V(1), one V(2), and one Zn(1) atom to form distorted corner-sharing OMgV2Zn trigonal pyramids.