Li2Mn(PO4)2 crystallizes in the monoclinic Cc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(5), one O(6), and one O(8) atom to form distorted LiO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 61-80°. In the second Li site, Li(2) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), one O(5), and one O(6) atom. Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with three equivalent 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 one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and  a cornercorner with one Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-57°. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and corners with three equivalent Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-63°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Li(2), one Mn(1), and one P(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(1), one Li(2), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Mn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Li(1), one Li(2), and one P(2) atom. 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 trigonal planar geometry to one Li(1), one Mn(1), and one P(2) atom.
Li2Mn(PO4)2 crystallizes in the monoclinic Cc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(5), one O(6), and one O(8) atom to form distorted LiO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 61-80°. The Li(1)-O(2) bond length is 1.94 Å. The Li(1)-O(5) bond length is 2.19 Å. The Li(1)-O(6) bond length is 2.02 Å. The Li(1)-O(8) bond length is 2.08 Å. In the second Li site, Li(2) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), one O(5), and one O(6) atom. The Li(2)-O(1) bond length is 2.09 Å. The Li(2)-O(2) bond length is 2.03 Å. The Li(2)-O(5) bond length is 2.17 Å. The Li(2)-O(6) bond length is 2.02 Å. Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The Mn(1)-O(1) bond length is 1.97 Å. The Mn(1)-O(3) bond length is 1.88 Å. The Mn(1)-O(4) bond length is 1.90 Å. The Mn(1)-O(5) bond length is 2.18 Å. The Mn(1)-O(7) bond length is 1.87 Å. The Mn(1)-O(8) bond length is 1.96 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and  a cornercorner with one Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-57°. The P(1)-O(1) bond length is 1.58 Å. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(4) bond length is 1.56 Å. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and corners with three equivalent Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-63°. The P(2)-O(5) bond length is 1.59 Å. The P(2)-O(6) bond length is 1.51 Å. The P(2)-O(7) bond length is 1.54 Å. The P(2)-O(8) bond length is 1.58 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Li(2), one Mn(1), and one P(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(1), one Li(2), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Mn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Li(1), one Li(2), and one P(2) atom. 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 trigonal planar geometry to one Li(1), one Mn(1), and one P(2) atom.