LiMn(SiO3)2 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 38-62°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Li(1), two equivalent Mn(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Li(1), one Mn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms.
LiMn(SiO3)2 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Li(1)-O(1) bond lengths are 2.08 Å. Both Li(1)-O(2) bond lengths are 2.09 Å. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. Both Mn(1)-O(2) bond lengths are 2.00 Å. There are two shorter (1.94 Å) and two longer (2.29 Å) Mn(1)-O(1) bond lengths. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 38-62°. The Si(1)-O(1) bond length is 1.67 Å. The Si(1)-O(2) bond length is 1.61 Å. Both Si(1)-O(3) bond lengths are 1.64 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Li(1), two equivalent Mn(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Li(1), one Mn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms.