Mn2(PO3)5 crystallizes in the monoclinic P2/c space group. Mn(1) is bonded to one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form distorted MnO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids and corners with two equivalent P(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. In the third P site, P(3) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one P(2) and one P(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Mn(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a linear geometry to two equivalent P(3) atoms. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(2) atom.
Mn2(PO3)5 crystallizes in the monoclinic P2/c space group. Mn(1) is bonded to one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form distorted MnO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Mn(1)-O(2) bond length is 2.02 Å. The Mn(1)-O(3) bond length is 2.07 Å. The Mn(1)-O(5) bond length is 2.17 Å. The Mn(1)-O(7) bond length is 2.02 Å. The Mn(1)-O(8) bond length is 2.07 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids and corners with two equivalent P(2)O4 tetrahedra. Both P(1)-O(3) bond lengths are 1.51 Å. Both P(1)-O(4) bond lengths are 1.61 Å. In the second P site, P(2) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The P(2)-O(1) bond length is 1.63 Å. The P(2)-O(4) bond length is 1.61 Å. The P(2)-O(7) bond length is 1.49 Å. The P(2)-O(8) bond length is 1.50 Å. In the third P site, P(3) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The P(3)-O(1) bond length is 1.59 Å. The P(3)-O(2) bond length is 1.51 Å. The P(3)-O(5) bond length is 1.52 Å. The P(3)-O(6) bond length is 1.57 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one P(2) and one P(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Mn(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a linear geometry to two equivalent P(3) atoms. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(2) atom.