Li2Mn(SiO3)2 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a distorted trigonal planar geometry to one O(2) and two equivalent O(1) atoms. Mn(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form MnO4 tetrahedra that share corners with four equivalent 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 two equivalent Mn(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Mn(1), and one Si(1) atom to form a mixture of distorted edge and corner-sharing OLi2MnSi trigonal pyramids. 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 bent 120 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Si(1) atoms.
Li2Mn(SiO3)2 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a distorted trigonal planar geometry to one O(2) and two equivalent O(1) atoms. The Li(1)-O(2) bond length is 1.95 Å. There is one shorter (2.00 Å) and one longer (2.05 Å) Li(1)-O(1) bond length. Mn(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form MnO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. Both Mn(1)-O(1) bond lengths are 2.12 Å. Both Mn(1)-O(2) bond lengths are 2.07 Å. 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 two equivalent Mn(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. The Si(1)-O(1) bond length is 1.64 Å. The Si(1)-O(2) bond length is 1.62 Å. The Si(1)-O(3) bond length is 1.67 Å. The Si(1)-O(4) bond length is 1.63 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Mn(1), and one Si(1) atom to form a mixture of distorted edge and corner-sharing OLi2MnSi trigonal pyramids. 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 bent 120 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Si(1) atoms.