MgMn2(SbO3)4 crystallizes in the monoclinic P2 space group. Mg(1) is bonded to two equivalent O(1) and two equivalent O(6) atoms to form MgO4 tetrahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with two equivalent Sb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-52°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with four equivalent Sb(3)O6 octahedra, corners with four equivalent Sb(4)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-54°. In the second Mn site, Mn(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form SbO6 octahedra that share corners with four equivalent Sb(3)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-44°. In the second Sb site, Sb(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(3) and two equivalent O(6) atoms. In the third Sb site, Sb(3) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, and  an edgeedge with one Sb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. In the fourth Sb site, Sb(4) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, and  an edgeedge with one Sb(3)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(1), one Sb(1), and one Sb(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(1), one Sb(2), and one Sb(4) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mn(2), one Sb(1), and one Sb(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mn(1), one Sb(3), and one Sb(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one Sb(2), and one Sb(4) atom.
MgMn2(SbO3)4 crystallizes in the monoclinic P2 space group. Mg(1) is bonded to two equivalent O(1) and two equivalent O(6) atoms to form MgO4 tetrahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with two equivalent Sb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-52°. Both Mg(1)-O(1) bond lengths are 1.97 Å. Both Mg(1)-O(6) bond lengths are 2.02 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with four equivalent Sb(3)O6 octahedra, corners with four equivalent Sb(4)O6 octahedra, and  an edgeedge with one Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-54°. Both Mn(1)-O(2) bond lengths are 2.11 Å. Both Mn(1)-O(3) bond lengths are 2.15 Å. Both Mn(1)-O(5) bond lengths are 2.26 Å. In the second Mn site, Mn(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. Both Mn(2)-O(1) bond lengths are 2.07 Å. Both Mn(2)-O(4) bond lengths are 2.09 Å. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form SbO6 octahedra that share corners with four equivalent Sb(3)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-44°. Both Sb(1)-O(1) bond lengths are 2.01 Å. Both Sb(1)-O(2) bond lengths are 2.04 Å. Both Sb(1)-O(4) bond lengths are 2.10 Å. In the second Sb site, Sb(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(3) and two equivalent O(6) atoms. Both Sb(2)-O(3) bond lengths are 2.00 Å. Both Sb(2)-O(6) bond lengths are 2.22 Å. In the third Sb site, Sb(3) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form SbO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra, corners with four equivalent Sb(1)O6 octahedra, and  an edgeedge with one Sb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. Both Sb(3)-O(2) bond lengths are 2.04 Å. Both Sb(3)-O(4) bond lengths are 2.08 Å. Both Sb(3)-O(5) bond lengths are 2.03 Å. In the fourth Sb site, Sb(4) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, and  an edgeedge with one Sb(3)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. Both Sb(4)-O(3) bond lengths are 2.03 Å. Both Sb(4)-O(5) bond lengths are 2.06 Å. Both Sb(4)-O(6) bond lengths are 2.03 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(1), one Sb(1), and one Sb(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(1), one Sb(2), and one Sb(4) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mn(2), one Sb(1), and one Sb(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mn(1), one Sb(3), and one Sb(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one Sb(2), and one Sb(4) atom.