MgAgBiO5 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted MgO6 octahedra that share corners with two equivalent Bi(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, and edges with three equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-26°. Ag(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(5), and two equivalent O(1) atoms. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted BiO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra,  an edgeedge with one Bi(1)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-26°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Ag(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Ag(1), and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mg(1), one Ag(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a see-saw-like geometry to two equivalent Mg(1) and two equivalent Bi(1) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Ag(1), and one Bi(1) atom.
MgAgBiO5 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted MgO6 octahedra that share corners with two equivalent Bi(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, and edges with three equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-26°. The Mg(1)-O(1) bond length is 2.15 Å. The Mg(1)-O(2) bond length is 2.10 Å. The Mg(1)-O(3) bond length is 1.98 Å. The Mg(1)-O(5) bond length is 2.08 Å. There is one shorter (2.16 Å) and one longer (2.28 Å) Mg(1)-O(4) bond length. Ag(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(5), and two equivalent O(1) atoms. The Ag(1)-O(2) bond length is 2.07 Å. The Ag(1)-O(3) bond length is 2.01 Å. The Ag(1)-O(5) bond length is 2.03 Å. There is one shorter (2.12 Å) and one longer (2.62 Å) Ag(1)-O(1) bond length. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(5), and two equivalent O(4) atoms to form distorted BiO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra,  an edgeedge with one Bi(1)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 21-26°. The Bi(1)-O(1) bond length is 2.13 Å. The Bi(1)-O(2) bond length is 2.13 Å. The Bi(1)-O(3) bond length is 2.11 Å. The Bi(1)-O(5) bond length is 2.18 Å. There is one shorter (2.21 Å) and one longer (2.24 Å) Bi(1)-O(4) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Ag(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Ag(1), and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mg(1), one Ag(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a see-saw-like geometry to two equivalent Mg(1) and two equivalent Bi(1) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Ag(1), and one Bi(1) atom.