MgSb2(PO5)2 crystallizes in the orthorhombic Fdd2 space group. Mg(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form distorted MgO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra and corners with two equivalent Sb(1)O5 trigonal bipyramids. Sb(1) is bonded to one O(1), one O(4), one O(5), and two equivalent O(2) atoms to form distorted SbO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and corners with two equivalent Sb(1)O5 trigonal bipyramids. P(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra and corners with three equivalent Sb(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Sb(1) atoms. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Sb(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom.
MgSb2(PO5)2 crystallizes in the orthorhombic Fdd2 space group. Mg(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form distorted MgO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra and corners with two equivalent Sb(1)O5 trigonal bipyramids. Both Mg(1)-O(3) bond lengths are 2.02 Å. Both Mg(1)-O(4) bond lengths are 2.09 Å. Sb(1) is bonded to one O(1), one O(4), one O(5), and two equivalent O(2) atoms to form distorted SbO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and corners with two equivalent Sb(1)O5 trigonal bipyramids. The Sb(1)-O(1) bond length is 2.08 Å. The Sb(1)-O(4) bond length is 2.44 Å. The Sb(1)-O(5) bond length is 2.02 Å. There is one shorter (1.95 Å) and one longer (1.99 Å) Sb(1)-O(2) bond length. P(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra and corners with three equivalent Sb(1)O5 trigonal bipyramids. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(3) bond length is 1.52 Å. The P(1)-O(4) bond length is 1.57 Å. The P(1)-O(5) bond length is 1.57 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Sb(1) atoms. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Sb(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom.