MgV4As2O13 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(13), one O(2), one O(5), and one O(8) atom. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(10), one O(2), one O(3), and one O(9) atom to form VO5 trigonal bipyramids that share corners with two equivalent V(2)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra,  an edgeedge with one V(2)O6 octahedra, and  an edgeedge with one V(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-49°. In the second V site, V(2) is bonded to one O(1), one O(12), one O(2), one O(3), one O(5), and one O(9) atom to form VO6 octahedra that share  a cornercorner with one V(3)O6 octahedra,  a cornercorner with one V(4)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent V(1)O5 trigonal bipyramids, and  an edgeedge with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 11-30°. In the third V site, V(3) is bonded to one O(10), one O(11), one O(3), one O(4), one O(6), and one O(7) atom to form distorted VO6 octahedra that share  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(4)O6 octahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with three equivalent As(1)O4 tetrahedra,  an edgeedge with one V(4)O6 octahedra, and  an edgeedge with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 10-30°. In the fourth V site, V(4) is bonded to one O(13), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted VO6 octahedra that share  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(3)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra, and  an edgeedge with one V(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-11°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(10), one O(11), one O(12), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(4)O6 octahedra, corners with three equivalent V(3)O6 octahedra, and  a cornercorner with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 31-58°. In the second As site, As(2) is bonded to one O(13), one O(7), one O(8), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(3)O6 octahedra, corners with three equivalent V(4)O6 octahedra, and  a cornercorner with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 36-55°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1), one V(1), and one V(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one V(1), and one V(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one V(1), one V(2), and one V(3) atom. In the fourth O site, O(4) is bonded in a linear geometry to one V(3) and one V(4) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one V(2), and one V(4) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one V(3), one V(4), and one As(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one V(3), one V(4), and one As(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one V(4), and one As(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one V(1), one V(2), and one As(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one V(1), one V(3), and one As(1) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one V(3) and one As(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one As(1) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Mg(1), one V(4), and one As(2) atom.
MgV4As2O13 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(13), one O(2), one O(5), and one O(8) atom. The Mg(1)-O(1) bond length is 1.91 Å. The Mg(1)-O(12) bond length is 2.33 Å. The Mg(1)-O(13) bond length is 2.14 Å. The Mg(1)-O(2) bond length is 2.20 Å. The Mg(1)-O(5) bond length is 2.00 Å. The Mg(1)-O(8) bond length is 2.14 Å. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(10), one O(2), one O(3), and one O(9) atom to form VO5 trigonal bipyramids that share corners with two equivalent V(2)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra,  an edgeedge with one V(2)O6 octahedra, and  an edgeedge with one V(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-49°. The V(1)-O(1) bond length is 1.83 Å. The V(1)-O(10) bond length is 1.99 Å. The V(1)-O(2) bond length is 1.76 Å. The V(1)-O(3) bond length is 1.92 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(12), one O(2), one O(3), one O(5), and one O(9) atom to form VO6 octahedra that share  a cornercorner with one V(3)O6 octahedra,  a cornercorner with one V(4)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent V(1)O5 trigonal bipyramids, and  an edgeedge with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 11-30°. The V(2)-O(1) bond length is 1.94 Å. The V(2)-O(12) bond length is 2.14 Å. The V(2)-O(2) bond length is 2.04 Å. The V(2)-O(3) bond length is 2.08 Å. The V(2)-O(5) bond length is 1.95 Å. The V(2)-O(9) bond length is 2.23 Å. In the third V site, V(3) is bonded to one O(10), one O(11), one O(3), one O(4), one O(6), and one O(7) atom to form distorted VO6 octahedra that share  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(4)O6 octahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with three equivalent As(1)O4 tetrahedra,  an edgeedge with one V(4)O6 octahedra, and  an edgeedge with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 10-30°. The V(3)-O(10) bond length is 2.25 Å. The V(3)-O(11) bond length is 2.01 Å. The V(3)-O(3) bond length is 1.93 Å. The V(3)-O(4) bond length is 1.70 Å. The V(3)-O(6) bond length is 2.16 Å. The V(3)-O(7) bond length is 2.08 Å. In the fourth V site, V(4) is bonded to one O(13), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted VO6 octahedra that share  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(3)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra, and  an edgeedge with one V(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-11°. The V(4)-O(13) bond length is 2.19 Å. The V(4)-O(4) bond length is 1.95 Å. The V(4)-O(5) bond length is 1.89 Å. The V(4)-O(6) bond length is 2.12 Å. The V(4)-O(7) bond length is 2.16 Å. The V(4)-O(8) bond length is 2.12 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(10), one O(11), one O(12), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(4)O6 octahedra, corners with three equivalent V(3)O6 octahedra, and  a cornercorner with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 31-58°. The As(1)-O(10) bond length is 1.75 Å. The As(1)-O(11) bond length is 1.70 Å. The As(1)-O(12) bond length is 1.72 Å. The As(1)-O(6) bond length is 1.76 Å. In the second As site, As(2) is bonded to one O(13), one O(7), one O(8), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one V(2)O6 octahedra,  a cornercorner with one V(3)O6 octahedra, corners with three equivalent V(4)O6 octahedra, and  a cornercorner with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 36-55°. The As(2)-O(13) bond length is 1.72 Å. The As(2)-O(7) bond length is 1.74 Å. The As(2)-O(8) bond length is 1.70 Å. The As(2)-O(9) bond length is 1.76 Å. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1), one V(1), and one V(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one V(1), and one V(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one V(1), one V(2), and one V(3) atom. In the fourth O site, O(4) is bonded in a linear geometry to one V(3) and one V(4) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one V(2), and one V(4) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one V(3), one V(4), and one As(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one V(3), one V(4), and one As(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one V(4), and one As(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one V(1), one V(2), and one As(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one V(1), one V(3), and one As(1) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one V(3) and one As(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one As(1) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Mg(1), one V(4), and one As(2) atom.