MgV2Pb3O8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(4), one O(6), one O(7), and one O(8) atom to form MgO5 trigonal bipyramids that share  a cornercorner with one V(2)O4 tetrahedra, corners with two equivalent V(1)O5 trigonal bipyramids, and  an edgeedge with one V(2)O4 tetrahedra. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(7) atom to form distorted VO5 trigonal bipyramids that share  a cornercorner with one V(2)O4 tetrahedra and corners with two equivalent Mg(1)O5 trigonal bipyramids. In the second V site, V(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form VO4 tetrahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one V(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are three inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(7), and one O(8) atom. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(6) atom. In the third Pb site, Pb(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one V(1), and one Pb(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one V(1), one V(2), one Pb(1), and one Pb(3) atom. In the third O site, O(3) is bonded to one V(1), one Pb(1), one Pb(2), and one Pb(3) atom to form distorted corner-sharing OVPb3 trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one Mg(1), one V(2), and one Pb(3) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one V(1), one Pb(2), and one Pb(3) atom. In the sixth O site, O(6) is bonded to one Mg(1), one V(2), one Pb(2), and one Pb(3) atom to form distorted corner-sharing OMgVPb2 trigonal pyramids. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one V(1), and one Pb(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one Pb(1) atom.
MgV2Pb3O8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(4), one O(6), one O(7), and one O(8) atom to form MgO5 trigonal bipyramids that share  a cornercorner with one V(2)O4 tetrahedra, corners with two equivalent V(1)O5 trigonal bipyramids, and  an edgeedge with one V(2)O4 tetrahedra. The Mg(1)-O(1) bond length is 2.12 Å. The Mg(1)-O(4) bond length is 2.10 Å. The Mg(1)-O(6) bond length is 2.10 Å. The Mg(1)-O(7) bond length is 2.08 Å. The Mg(1)-O(8) bond length is 2.04 Å. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(7) atom to form distorted VO5 trigonal bipyramids that share  a cornercorner with one V(2)O4 tetrahedra and corners with two equivalent Mg(1)O5 trigonal bipyramids. The V(1)-O(1) bond length is 1.85 Å. The V(1)-O(2) bond length is 2.20 Å. The V(1)-O(3) bond length is 1.96 Å. The V(1)-O(5) bond length is 1.81 Å. The V(1)-O(7) bond length is 1.93 Å. In the second V site, V(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form VO4 tetrahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one V(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The V(2)-O(2) bond length is 1.87 Å. The V(2)-O(4) bond length is 1.77 Å. The V(2)-O(6) bond length is 1.91 Å. The V(2)-O(8) bond length is 1.79 Å. There are three inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(7), and one O(8) atom. The Pb(1)-O(2) bond length is 2.35 Å. The Pb(1)-O(3) bond length is 2.34 Å. The Pb(1)-O(7) bond length is 2.33 Å. The Pb(1)-O(8) bond length is 2.57 Å. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(6) atom. The Pb(2)-O(3) bond length is 2.35 Å. The Pb(2)-O(5) bond length is 2.35 Å. The Pb(2)-O(6) bond length is 2.34 Å. In the third Pb site, Pb(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Pb(3)-O(1) bond length is 2.36 Å. The Pb(3)-O(2) bond length is 2.56 Å. The Pb(3)-O(3) bond length is 2.63 Å. The Pb(3)-O(4) bond length is 2.77 Å. The Pb(3)-O(5) bond length is 2.82 Å. The Pb(3)-O(6) bond length is 2.39 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one V(1), and one Pb(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one V(1), one V(2), one Pb(1), and one Pb(3) atom. In the third O site, O(3) is bonded to one V(1), one Pb(1), one Pb(2), and one Pb(3) atom to form distorted corner-sharing OVPb3 trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one Mg(1), one V(2), and one Pb(3) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one V(1), one Pb(2), and one Pb(3) atom. In the sixth O site, O(6) is bonded to one Mg(1), one V(2), one Pb(2), and one Pb(3) atom to form distorted corner-sharing OMgVPb2 trigonal pyramids. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one V(1), and one Pb(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one Pb(1) atom.