MgYMo(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(7) atom. Y(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted edge-sharing WO6 octahedra. In the second W site, W(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form edge-sharing WO6 octahedra. Mo(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(5), and one O(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Y(1), and one W(1) atom. In the second O site, O(2) is bonded to one Mg(1), one Y(1), one W(1), and one Mo(1) atom to form distorted OYMgMoW trigonal pyramids that share  a cornercorner with one O(4)YMgW2 trigonal pyramid,  a cornercorner with one O(3)YMoW2 trigonal pyramid,  an edgeedge with one O(4)YMgW2 trigonal pyramid, and  an edgeedge with one O(3)YMoW2 trigonal pyramid. In the third O site, O(3) is bonded to one Y(1), one W(1), one W(2), and one Mo(1) atom to form OYMoW2 trigonal pyramids that share  a cornercorner with one O(2)YMgMoW trigonal pyramid, corners with three equivalent O(4)YMgW2 trigonal pyramids, and  an edgeedge with one O(2)YMgMoW trigonal pyramid. In the fourth O site, O(4) is bonded to one Mg(1), one Y(1), one W(1), and one W(2) atom to form distorted OYMgW2 trigonal pyramids that share  a cornercorner with one O(2)YMgMoW trigonal pyramid, corners with three equivalent O(3)YMoW2 trigonal pyramids, and  an edgeedge with one O(2)YMgMoW trigonal pyramid. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(2), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Y(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Mg(1), one W(1), one W(2), and one Mo(1) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Y(1), one W(1), and one W(2) atom.
MgYMo(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(7) atom. The Mg(1)-O(1) bond length is 1.97 Å. The Mg(1)-O(2) bond length is 2.16 Å. The Mg(1)-O(4) bond length is 2.14 Å. The Mg(1)-O(5) bond length is 1.95 Å. The Mg(1)-O(7) bond length is 2.34 Å. Y(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. The Y(1)-O(1) bond length is 2.43 Å. The Y(1)-O(2) bond length is 2.27 Å. The Y(1)-O(3) bond length is 2.34 Å. The Y(1)-O(4) bond length is 2.33 Å. The Y(1)-O(6) bond length is 2.24 Å. The Y(1)-O(8) bond length is 2.31 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted edge-sharing WO6 octahedra. The W(1)-O(1) bond length is 1.96 Å. The W(1)-O(2) bond length is 2.17 Å. The W(1)-O(3) bond length is 2.17 Å. The W(1)-O(4) bond length is 2.22 Å. The W(1)-O(7) bond length is 2.08 Å. The W(1)-O(8) bond length is 2.06 Å. In the second W site, W(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form edge-sharing WO6 octahedra. The W(2)-O(3) bond length is 2.08 Å. The W(2)-O(4) bond length is 2.06 Å. The W(2)-O(5) bond length is 1.99 Å. The W(2)-O(6) bond length is 1.86 Å. The W(2)-O(7) bond length is 2.16 Å. The W(2)-O(8) bond length is 2.06 Å. Mo(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(5), and one O(7) atom. The Mo(1)-O(2) bond length is 2.22 Å. The Mo(1)-O(3) bond length is 2.21 Å. The Mo(1)-O(5) bond length is 2.15 Å. The Mo(1)-O(7) bond length is 2.18 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Y(1), and one W(1) atom. In the second O site, O(2) is bonded to one Mg(1), one Y(1), one W(1), and one Mo(1) atom to form distorted OYMgMoW trigonal pyramids that share  a cornercorner with one O(4)YMgW2 trigonal pyramid,  a cornercorner with one O(3)YMoW2 trigonal pyramid,  an edgeedge with one O(4)YMgW2 trigonal pyramid, and  an edgeedge with one O(3)YMoW2 trigonal pyramid. In the third O site, O(3) is bonded to one Y(1), one W(1), one W(2), and one Mo(1) atom to form OYMoW2 trigonal pyramids that share  a cornercorner with one O(2)YMgMoW trigonal pyramid, corners with three equivalent O(4)YMgW2 trigonal pyramids, and  an edgeedge with one O(2)YMgMoW trigonal pyramid. In the fourth O site, O(4) is bonded to one Mg(1), one Y(1), one W(1), and one W(2) atom to form distorted OYMgW2 trigonal pyramids that share  a cornercorner with one O(2)YMgMoW trigonal pyramid, corners with three equivalent O(3)YMoW2 trigonal pyramids, and  an edgeedge with one O(2)YMgMoW trigonal pyramid. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(2), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Y(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Mg(1), one W(1), one W(2), and one Mo(1) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Y(1), one W(1), and one W(2) atom.