MgYAg(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MgO6 octahedra that share corners with two equivalent Y(1)O6 octahedra, edges with two equivalent W(1)O6 octahedra, edges with two equivalent W(2)O6 octahedra, and  a faceface with one Y(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 61-62°. Y(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form distorted YO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent W(1)O6 octahedra, corners with four equivalent W(2)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-62°. 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 WO6 octahedra that share corners with four equivalent Y(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-54°. 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 WO6 octahedra that share corners with four equivalent Y(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-58°. Ag(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), one Y(1), one W(1), and one Ag(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one Y(1), and one W(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one W(1), one W(2), and one Ag(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Y(1), one W(1), one W(2), and one Ag(1) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mg(1), one Y(1), one W(2), and one Ag(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), one Y(1), one W(2), and one Ag(1) atom. In the seventh O site, O(7) is bonded to one Mg(1), one W(1), one W(2), and one Ag(1) atom to form a mixture of distorted corner and edge-sharing OMgAgW2 trigonal pyramids. In the eighth O site, O(8) is bonded to one Mg(1), one Y(1), one W(1), and one W(2) atom to form a mixture of corner and edge-sharing OYMgW2 trigonal pyramids.
MgYAg(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MgO6 octahedra that share corners with two equivalent Y(1)O6 octahedra, edges with two equivalent W(1)O6 octahedra, edges with two equivalent W(2)O6 octahedra, and  a faceface with one Y(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 61-62°. The Mg(1)-O(1) bond length is 2.15 Å. The Mg(1)-O(2) bond length is 2.11 Å. The Mg(1)-O(5) bond length is 2.18 Å. The Mg(1)-O(6) bond length is 2.03 Å. The Mg(1)-O(7) bond length is 2.04 Å. The Mg(1)-O(8) bond length is 2.33 Å. Y(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form distorted YO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent W(1)O6 octahedra, corners with four equivalent W(2)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-62°. The Y(1)-O(1) bond length is 2.27 Å. The Y(1)-O(2) bond length is 2.25 Å. The Y(1)-O(4) bond length is 2.29 Å. The Y(1)-O(5) bond length is 2.60 Å. The Y(1)-O(6) bond length is 2.25 Å. The Y(1)-O(8) bond length is 2.39 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 WO6 octahedra that share corners with four equivalent Y(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-54°. The W(1)-O(1) bond length is 2.00 Å. The W(1)-O(2) bond length is 1.94 Å. The W(1)-O(3) bond length is 1.94 Å. The W(1)-O(4) bond length is 2.12 Å. The W(1)-O(7) bond length is 2.09 Å. The W(1)-O(8) bond length is 2.08 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 WO6 octahedra that share corners with four equivalent Y(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-58°. The W(2)-O(3) bond length is 2.06 Å. The W(2)-O(4) bond length is 2.04 Å. The W(2)-O(5) bond length is 1.88 Å. The W(2)-O(6) bond length is 2.03 Å. The W(2)-O(7) bond length is 2.08 Å. The W(2)-O(8) bond length is 2.14 Å. Ag(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The Ag(1)-O(1) bond length is 2.32 Å. The Ag(1)-O(3) bond length is 2.27 Å. The Ag(1)-O(4) bond length is 2.74 Å. The Ag(1)-O(5) bond length is 2.34 Å. The Ag(1)-O(6) bond length is 2.70 Å. The Ag(1)-O(7) bond length is 2.52 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), one Y(1), one W(1), and one Ag(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one Y(1), and one W(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one W(1), one W(2), and one Ag(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Y(1), one W(1), one W(2), and one Ag(1) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mg(1), one Y(1), one W(2), and one Ag(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), one Y(1), one W(2), and one Ag(1) atom. In the seventh O site, O(7) is bonded to one Mg(1), one W(1), one W(2), and one Ag(1) atom to form a mixture of distorted corner and edge-sharing OMgAgW2 trigonal pyramids. In the eighth O site, O(8) is bonded to one Mg(1), one Y(1), one W(1), and one W(2) atom to form a mixture of corner and edge-sharing OYMgW2 trigonal pyramids.