Li1MnSiO4 crystallizes in the orthorhombic Pna2_1 space group. Li(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with five equivalent Mn(1)O5 square pyramids and corners with four equivalent Si(1)O4 tetrahedra. Mn(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mn(1)O5 square pyramids, corners with three equivalent Si(1)O4 tetrahedra, corners with five equivalent Li(1)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with three equivalent Mn(1)O5 square pyramids, corners with four equivalent Li(1)O4 tetrahedra, and  an edgeedge with one Mn(1)O5 square pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(1), one Mn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Mn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Li(1), two equivalent Mn(1), and one Si(1) atom.
Li1MnSiO4 crystallizes in the orthorhombic Pna2_1 space group. Li(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with five equivalent Mn(1)O5 square pyramids and corners with four equivalent Si(1)O4 tetrahedra. The Li(1)-O(1) bond length is 1.95 Å. The Li(1)-O(2) bond length is 1.94 Å. The Li(1)-O(3) bond length is 1.97 Å. The Li(1)-O(4) bond length is 2.22 Å. Mn(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mn(1)O5 square pyramids, corners with three equivalent Si(1)O4 tetrahedra, corners with five equivalent Li(1)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The Mn(1)-O(1) bond length is 1.93 Å. The Mn(1)-O(2) bond length is 1.93 Å. The Mn(1)-O(3) bond length is 1.92 Å. There is one shorter (2.07 Å) and one longer (2.32 Å) Mn(1)-O(4) bond length. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with three equivalent Mn(1)O5 square pyramids, corners with four equivalent Li(1)O4 tetrahedra, and  an edgeedge with one Mn(1)O5 square pyramid. The Si(1)-O(1) bond length is 1.65 Å. The Si(1)-O(2) bond length is 1.64 Å. The Si(1)-O(3) bond length is 1.62 Å. The Si(1)-O(4) bond length is 1.69 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(1), and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(1), one Mn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Mn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Li(1), two equivalent Mn(1), and one Si(1) atom.