MoZn2SeO7 crystallizes in the monoclinic P2_1 space group. Mo(1) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form MoO4 tetrahedra that share corners with three equivalent Zn(2)O6 octahedra and  a cornercorner with one Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-60°. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form distorted ZnO4 tetrahedra that share corners with three equivalent Zn(2)O6 octahedra and  a cornercorner with one Mo(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-68°. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted ZnO6 octahedra that share corners with three equivalent Mo(1)O4 tetrahedra and corners with three equivalent Zn(1)O4 tetrahedra. Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(4) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one Se(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one Se(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mo(1) and one Zn(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Mo(1) and one Zn(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mo(1) and one Zn(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mo(1) and one Zn(1) atom.
MoZn2SeO7 crystallizes in the monoclinic P2_1 space group. Mo(1) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form MoO4 tetrahedra that share corners with three equivalent Zn(2)O6 octahedra and  a cornercorner with one Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-60°. The Mo(1)-O(3) bond length is 1.82 Å. The Mo(1)-O(5) bond length is 1.80 Å. The Mo(1)-O(6) bond length is 1.79 Å. The Mo(1)-O(7) bond length is 1.79 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form distorted ZnO4 tetrahedra that share corners with three equivalent Zn(2)O6 octahedra and  a cornercorner with one Mo(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-68°. The Zn(1)-O(1) bond length is 1.99 Å. The Zn(1)-O(2) bond length is 2.03 Å. The Zn(1)-O(4) bond length is 2.00 Å. The Zn(1)-O(7) bond length is 1.99 Å. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted ZnO6 octahedra that share corners with three equivalent Mo(1)O4 tetrahedra and corners with three equivalent Zn(1)O4 tetrahedra. The Zn(2)-O(1) bond length is 2.27 Å. The Zn(2)-O(2) bond length is 2.20 Å. The Zn(2)-O(3) bond length is 2.11 Å. The Zn(2)-O(4) bond length is 2.24 Å. The Zn(2)-O(5) bond length is 2.00 Å. The Zn(2)-O(6) bond length is 2.05 Å. Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(4) atom. The Se(1)-O(1) bond length is 1.75 Å. The Se(1)-O(2) bond length is 1.74 Å. The Se(1)-O(4) bond length is 1.75 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one Se(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one Se(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mo(1) and one Zn(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Mo(1) and one Zn(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mo(1) and one Zn(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mo(1) and one Zn(1) atom.