Mn2P3O10 crystallizes in the monoclinic C2/c space group. Mn(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form MnO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with two equivalent Mn(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent Mn(1)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(2) atom.
Mn2P3O10 crystallizes in the monoclinic C2/c space group. Mn(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form MnO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. The Mn(1)-O(1) bond length is 2.02 Å. The Mn(1)-O(2) bond length is 2.04 Å. The Mn(1)-O(3) bond length is 1.98 Å. The Mn(1)-O(5) bond length is 2.02 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with two equivalent Mn(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. Both P(1)-O(2) bond lengths are 1.50 Å. Both P(1)-O(4) bond lengths are 1.62 Å. In the second P site, P(2) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent Mn(1)O4 tetrahedra. The P(2)-O(1) bond length is 1.53 Å. The P(2)-O(3) bond length is 1.53 Å. The P(2)-O(4) bond length is 1.63 Å. The P(2)-O(5) bond length is 1.52 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 Mn(1) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(2) atom.