MgAg2(GeO3)2 crystallizes in the orthorhombic Pmm2 space group. Mg(1) is bonded to one O(2) and four equivalent O(4) atoms to form distorted MgO5 square pyramids that share corners with four equivalent Ge(1)O6 octahedra, edges with two equivalent Mg(1)O5 square pyramids, and faces with two equivalent Ge(1)O6 octahedra. The corner-sharing octahedral tilt angles are 41°. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. In the second Ag site, Ag(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. Ge(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted GeO6 octahedra that share corners with two equivalent Ge(1)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, edges with two equivalent Ge(1)O6 octahedra, and  a faceface with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 22-50°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ag(1), one Ag(2), and two equivalent Ge(1) atoms to form distorted OAg2Ge2 trigonal pyramids that share corners with four equivalent O(1)Ag2Ge2 trigonal pyramids and edges with two equivalent O(2)MgAg2Ge2 square pyramids. In the second O site, O(2) is bonded to one Mg(1), two equivalent Ag(1), and two equivalent Ge(1) atoms to form distorted OMgAg2Ge2 square pyramids that share corners with two equivalent O(2)MgAg2Ge2 square pyramids and edges with four equivalent O(1)Ag2Ge2 trigonal pyramids. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ag(2) and two equivalent Ge(1) atoms. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Mg(1), one Ag(2), and two equivalent Ge(1) atoms.
MgAg2(GeO3)2 crystallizes in the orthorhombic Pmm2 space group. Mg(1) is bonded to one O(2) and four equivalent O(4) atoms to form distorted MgO5 square pyramids that share corners with four equivalent Ge(1)O6 octahedra, edges with two equivalent Mg(1)O5 square pyramids, and faces with two equivalent Ge(1)O6 octahedra. The corner-sharing octahedral tilt angles are 41°. The Mg(1)-O(2) bond length is 2.00 Å. All Mg(1)-O(4) bond lengths are 2.10 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Ag(1)-O(1) bond lengths are 2.46 Å. Both Ag(1)-O(2) bond lengths are 2.28 Å. In the second Ag site, Ag(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. Both Ag(2)-O(1) bond lengths are 2.52 Å. Both Ag(2)-O(3) bond lengths are 2.55 Å. Both Ag(2)-O(4) bond lengths are 2.70 Å. Ge(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted GeO6 octahedra that share corners with two equivalent Ge(1)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, edges with two equivalent Ge(1)O6 octahedra, and  a faceface with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 22-50°. The Ge(1)-O(2) bond length is 2.11 Å. The Ge(1)-O(3) bond length is 1.84 Å. Both Ge(1)-O(1) bond lengths are 1.88 Å. Both Ge(1)-O(4) bond lengths are 2.08 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ag(1), one Ag(2), and two equivalent Ge(1) atoms to form distorted OAg2Ge2 trigonal pyramids that share corners with four equivalent O(1)Ag2Ge2 trigonal pyramids and edges with two equivalent O(2)MgAg2Ge2 square pyramids. In the second O site, O(2) is bonded to one Mg(1), two equivalent Ag(1), and two equivalent Ge(1) atoms to form distorted OMgAg2Ge2 square pyramids that share corners with two equivalent O(2)MgAg2Ge2 square pyramids and edges with four equivalent O(1)Ag2Ge2 trigonal pyramids. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ag(2) and two equivalent Ge(1) atoms. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Mg(1), one Ag(2), and two equivalent Ge(1) atoms.