MgV2Zn2(SiO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(10), one O(2), one O(4), one O(5), one O(7), and one O(9) atom to form VO6 octahedra that share corners with two equivalent V(2)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Zn(1)O4 trigonal pyramid, and  an edgeedge with one Zn(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 37-38°. In the second V site, V(2) is bonded to one O(1), one O(10), one O(3), one O(6), one O(8), and one O(9) atom to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Zn(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 37-38°. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(10), one O(4), and one O(7) atom to form distorted ZnO4 trigonal pyramids that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-67°. In the second Zn site, Zn(2) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(5), and one O(9) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and corners with two equivalent Zn(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 36-60°. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form distorted SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and  a cornercorner with one Zn(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 36-60°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one V(2), one Zn(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one V(1), one Zn(2), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to one Mg(1), one V(2), one Zn(2), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one V(1), one Zn(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one V(1), one Zn(2), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one V(1), one Zn(1), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mg(1), one V(2), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one V(1), one V(2), and one Zn(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one V(1), one V(2), and one Zn(1) atom.
MgV2Zn2(SiO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom. The Mg(1)-O(1) bond length is 2.58 Å. The Mg(1)-O(3) bond length is 2.41 Å. The Mg(1)-O(5) bond length is 2.19 Å. The Mg(1)-O(6) bond length is 2.01 Å. The Mg(1)-O(7) bond length is 2.18 Å. The Mg(1)-O(8) bond length is 1.99 Å. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(10), one O(2), one O(4), one O(5), one O(7), and one O(9) atom to form VO6 octahedra that share corners with two equivalent V(2)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Zn(1)O4 trigonal pyramid, and  an edgeedge with one Zn(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 37-38°. The V(1)-O(10) bond length is 2.02 Å. The V(1)-O(2) bond length is 2.08 Å. The V(1)-O(4) bond length is 2.08 Å. The V(1)-O(5) bond length is 2.15 Å. The V(1)-O(7) bond length is 2.16 Å. The V(1)-O(9) bond length is 2.01 Å. In the second V site, V(2) is bonded to one O(1), one O(10), one O(3), one O(6), one O(8), and one O(9) atom to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Zn(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 37-38°. The V(2)-O(1) bond length is 2.19 Å. The V(2)-O(10) bond length is 2.04 Å. The V(2)-O(3) bond length is 2.20 Å. The V(2)-O(6) bond length is 2.00 Å. The V(2)-O(8) bond length is 2.00 Å. The V(2)-O(9) bond length is 2.06 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(10), one O(4), and one O(7) atom to form distorted ZnO4 trigonal pyramids that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-67°. The Zn(1)-O(1) bond length is 2.06 Å. The Zn(1)-O(10) bond length is 1.95 Å. The Zn(1)-O(4) bond length is 2.00 Å. The Zn(1)-O(7) bond length is 2.03 Å. In the second Zn site, Zn(2) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(5), and one O(9) atom. The Zn(2)-O(2) bond length is 2.01 Å. The Zn(2)-O(3) bond length is 2.08 Å. The Zn(2)-O(5) bond length is 2.02 Å. The Zn(2)-O(9) bond length is 1.95 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and corners with two equivalent Zn(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 36-60°. The Si(1)-O(1) bond length is 1.66 Å. The Si(1)-O(2) bond length is 1.60 Å. The Si(1)-O(7) bond length is 1.72 Å. The Si(1)-O(8) bond length is 1.64 Å. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form distorted SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and  a cornercorner with one Zn(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 36-60°. The Si(2)-O(3) bond length is 1.67 Å. The Si(2)-O(4) bond length is 1.59 Å. The Si(2)-O(5) bond length is 1.72 Å. The Si(2)-O(6) bond length is 1.64 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one V(2), one Zn(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one V(1), one Zn(2), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to one Mg(1), one V(2), one Zn(2), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one V(1), one Zn(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one V(1), one Zn(2), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one V(1), one Zn(1), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mg(1), one V(2), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one V(1), one V(2), and one Zn(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one V(1), one V(2), and one Zn(1) atom.