MgAg2(SnO3)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent Ag(2), one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a square co-planar geometry to one O(1), one O(2), one O(5), and one O(6) atom. In the second Ag site, Ag(2) is bonded in a 8-coordinate geometry to two equivalent Mg(1), one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form a mixture of edge and corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles range from 44-45°. In the second Sn site, Sn(2) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(6) atoms to form a mixture of edge and corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles range from 44-45°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Ag(1), one Ag(2), and two equivalent Sn(2) atoms to form distorted OAg2Sn2 tetrahedra that share corners with two equivalent O(1)Ag2Sn2 tetrahedra,  a cornercorner with one O(5)Mg2AgSn2 trigonal bipyramid, corners with three equivalent O(6)Mg2AgSn2 trigonal bipyramids,  an edgeedge with one O(2)Ag2Sn2 tetrahedra, and  an edgeedge with one O(6)Mg2AgSn2 trigonal bipyramid. In the second O site, O(2) is bonded to one Ag(1), one Ag(2), and two equivalent Sn(1) atoms to form distorted OAg2Sn2 tetrahedra that share corners with two equivalent O(2)Ag2Sn2 tetrahedra,  a cornercorner with one O(6)Mg2AgSn2 trigonal bipyramid, corners with three equivalent O(5)Mg2AgSn2 trigonal bipyramids,  an edgeedge with one O(1)Ag2Sn2 tetrahedra, and  an edgeedge with one O(5)Mg2AgSn2 trigonal bipyramid. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent Ag(2), one Sn(1), and one Sn(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent Ag(2), one Sn(1), and one Sn(2) atom. In the fifth O site, O(5) is bonded to two equivalent Mg(1), one Ag(1), and two equivalent Sn(1) atoms to form distorted OMg2AgSn2 trigonal bipyramids that share  a cornercorner with one O(1)Ag2Sn2 tetrahedra, corners with three equivalent O(2)Ag2Sn2 tetrahedra, corners with two equivalent O(6)Mg2AgSn2 trigonal bipyramids,  an edgeedge with one O(2)Ag2Sn2 tetrahedra, edges with two equivalent O(5)Mg2AgSn2 trigonal bipyramids, and  a faceface with one O(6)Mg2AgSn2 trigonal bipyramid. In the sixth O site, O(6) is bonded to two equivalent Mg(1), one Ag(1), and two equivalent Sn(2) atoms to form distorted OMg2AgSn2 trigonal bipyramids that share  a cornercorner with one O(2)Ag2Sn2 tetrahedra, corners with three equivalent O(1)Ag2Sn2 tetrahedra, corners with two equivalent O(5)Mg2AgSn2 trigonal bipyramids,  an edgeedge with one O(1)Ag2Sn2 tetrahedra, edges with two equivalent O(6)Mg2AgSn2 trigonal bipyramids, and  a faceface with one O(5)Mg2AgSn2 trigonal bipyramid.
MgAg2(SnO3)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent Ag(2), one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms. Both Mg(1)-Ag(2) bond lengths are 2.74 Å. The Mg(1)-O(3) bond length is 2.59 Å. The Mg(1)-O(4) bond length is 2.62 Å. There is one shorter (2.19 Å) and one longer (2.21 Å) Mg(1)-O(5) bond length. There is one shorter (2.19 Å) and one longer (2.21 Å) Mg(1)-O(6) bond length. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a square co-planar geometry to one O(1), one O(2), one O(5), and one O(6) atom. The Ag(1)-O(1) bond length is 2.22 Å. The Ag(1)-O(2) bond length is 2.21 Å. The Ag(1)-O(5) bond length is 2.32 Å. The Ag(1)-O(6) bond length is 2.34 Å. In the second Ag site, Ag(2) is bonded in a 8-coordinate geometry to two equivalent Mg(1), one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. The Ag(2)-O(1) bond length is 2.36 Å. The Ag(2)-O(2) bond length is 2.37 Å. There is one shorter (2.70 Å) and one longer (2.71 Å) Ag(2)-O(3) bond length. There is one shorter (2.68 Å) and one longer (2.70 Å) Ag(2)-O(4) bond length. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form a mixture of edge and corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles range from 44-45°. The Sn(1)-O(3) bond length is 2.16 Å. The Sn(1)-O(4) bond length is 2.14 Å. Both Sn(1)-O(2) bond lengths are 2.04 Å. Both Sn(1)-O(5) bond lengths are 2.22 Å. In the second Sn site, Sn(2) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(6) atoms to form a mixture of edge and corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles range from 44-45°. The Sn(2)-O(3) bond length is 2.14 Å. The Sn(2)-O(4) bond length is 2.16 Å. Both Sn(2)-O(1) bond lengths are 2.04 Å. Both Sn(2)-O(6) bond lengths are 2.22 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Ag(1), one Ag(2), and two equivalent Sn(2) atoms to form distorted OAg2Sn2 tetrahedra that share corners with two equivalent O(1)Ag2Sn2 tetrahedra,  a cornercorner with one O(5)Mg2AgSn2 trigonal bipyramid, corners with three equivalent O(6)Mg2AgSn2 trigonal bipyramids,  an edgeedge with one O(2)Ag2Sn2 tetrahedra, and  an edgeedge with one O(6)Mg2AgSn2 trigonal bipyramid. In the second O site, O(2) is bonded to one Ag(1), one Ag(2), and two equivalent Sn(1) atoms to form distorted OAg2Sn2 tetrahedra that share corners with two equivalent O(2)Ag2Sn2 tetrahedra,  a cornercorner with one O(6)Mg2AgSn2 trigonal bipyramid, corners with three equivalent O(5)Mg2AgSn2 trigonal bipyramids,  an edgeedge with one O(1)Ag2Sn2 tetrahedra, and  an edgeedge with one O(5)Mg2AgSn2 trigonal bipyramid. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent Ag(2), one Sn(1), and one Sn(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent Ag(2), one Sn(1), and one Sn(2) atom. In the fifth O site, O(5) is bonded to two equivalent Mg(1), one Ag(1), and two equivalent Sn(1) atoms to form distorted OMg2AgSn2 trigonal bipyramids that share  a cornercorner with one O(1)Ag2Sn2 tetrahedra, corners with three equivalent O(2)Ag2Sn2 tetrahedra, corners with two equivalent O(6)Mg2AgSn2 trigonal bipyramids,  an edgeedge with one O(2)Ag2Sn2 tetrahedra, edges with two equivalent O(5)Mg2AgSn2 trigonal bipyramids, and  a faceface with one O(6)Mg2AgSn2 trigonal bipyramid. In the sixth O site, O(6) is bonded to two equivalent Mg(1), one Ag(1), and two equivalent Sn(2) atoms to form distorted OMg2AgSn2 trigonal bipyramids that share  a cornercorner with one O(2)Ag2Sn2 tetrahedra, corners with three equivalent O(1)Ag2Sn2 tetrahedra, corners with two equivalent O(5)Mg2AgSn2 trigonal bipyramids,  an edgeedge with one O(1)Ag2Sn2 tetrahedra, edges with two equivalent O(6)Mg2AgSn2 trigonal bipyramids, and  a faceface with one O(5)Mg2AgSn2 trigonal bipyramid.