LiMnPO4 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted LiO4 trigonal pyramids that share corners with two equivalent Mn(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra,  an edgeedge with one Mn(1)O4 tetrahedra,  an edgeedge with one P(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 trigonal pyramid. Mn(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MnO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra, corners with two equivalent Li(1)O4 trigonal pyramids, and  an edgeedge with one Li(1)O4 trigonal pyramid. 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 four equivalent Mn(1)O4 tetrahedra, corners with two equivalent Li(1)O4 trigonal pyramids, and  an edgeedge with one Li(1)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Li(1), one Mn(1), and one P(1) atom. In the second O site, O(2) is bonded to two equivalent Li(1), one Mn(1), and one P(1) atom to form distorted edge-sharing OLi2MnP trigonal pyramids. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Mn(1) and one P(1) atom.
LiMnPO4 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted LiO4 trigonal pyramids that share corners with two equivalent Mn(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra,  an edgeedge with one Mn(1)O4 tetrahedra,  an edgeedge with one P(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 trigonal pyramid. The Li(1)-O(1) bond length is 1.96 Å. The Li(1)-O(3) bond length is 2.03 Å. There is one shorter (1.97 Å) and one longer (2.39 Å) Li(1)-O(2) bond length. Mn(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MnO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra, corners with two equivalent Li(1)O4 trigonal pyramids, and  an edgeedge with one Li(1)O4 trigonal pyramid. The Mn(1)-O(1) bond length is 2.13 Å. The Mn(1)-O(2) bond length is 2.13 Å. The Mn(1)-O(3) bond length is 2.07 Å. The Mn(1)-O(4) bond length is 2.02 Å. 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 four equivalent Mn(1)O4 tetrahedra, corners with two equivalent Li(1)O4 trigonal pyramids, and  an edgeedge with one Li(1)O4 trigonal pyramid. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(2) bond length is 1.58 Å. The P(1)-O(3) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.53 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Li(1), one Mn(1), and one P(1) atom. In the second O site, O(2) is bonded to two equivalent Li(1), one Mn(1), and one P(1) atom to form distorted edge-sharing OLi2MnP trigonal pyramids. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Mn(1) and one P(1) atom.