MgSb3O7 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(4) atoms. In the second Sb site, Sb(2) is bonded in a distorted trigonal bipyramidal geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one Sb(2) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1) and two equivalent Sb(1) atoms. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Sb(1), and one Sb(2) atom. In the fourth O site, O(2) is bonded to one Mg(1), one Sb(2), and two equivalent Sb(1) atoms to form a mixture of distorted edge and corner-sharing OMgSb3 trigonal pyramids.
MgSb3O7 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. The Mg(1)-O(3) bond length is 2.22 Å. Both Mg(1)-O(1) bond lengths are 2.26 Å. Both Mg(1)-O(2) bond lengths are 2.52 Å. Both Mg(1)-O(4) bond lengths are 2.18 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(4) atoms. The Sb(1)-O(1) bond length is 2.05 Å. There is one shorter (2.25 Å) and one longer (2.46 Å) Sb(1)-O(2) bond length. There is one shorter (2.07 Å) and one longer (2.11 Å) Sb(1)-O(4) bond length. In the second Sb site, Sb(2) is bonded in a distorted trigonal bipyramidal geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Sb(2)-O(3) bond length is 1.92 Å. Both Sb(2)-O(1) bond lengths are 2.03 Å. Both Sb(2)-O(2) bond lengths are 1.98 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one Sb(2) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1) and two equivalent Sb(1) atoms. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Sb(1), and one Sb(2) atom. In the fourth O site, O(2) is bonded to one Mg(1), one Sb(2), and two equivalent Sb(1) atoms to form a mixture of distorted edge and corner-sharing OMgSb3 trigonal pyramids.