Li2MnSiO4 is beta beryllia-derived structured and crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Li sites. In the first Li site, 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 two equivalent Li(2)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Mn(1)O4 tetrahedra. In the second Li site, Li(2) 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 two equivalent Li(1)O4 tetrahedra, corners with four equivalent Mn(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. 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 two equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(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 four equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with four equivalent Mn(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2MnSi trigonal pyramids. In the second O site, O(2) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form corner-sharing OLi2MnSi tetrahedra. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2MnSi tetrahedra. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form a mixture of corner and edge-sharing OLi2MnSi tetrahedra.
Li2MnSiO4 is beta beryllia-derived structured and crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Li sites. In the first Li site, 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 two equivalent Li(2)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Mn(1)O4 tetrahedra. The Li(1)-O(1) bond length is 2.06 Å. The Li(1)-O(2) bond length is 1.94 Å. The Li(1)-O(3) bond length is 2.08 Å. The Li(1)-O(4) bond length is 2.02 Å. In the second Li site, Li(2) 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 two equivalent Li(1)O4 tetrahedra, corners with four equivalent Mn(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. The Li(2)-O(1) bond length is 1.95 Å. The Li(2)-O(2) bond length is 1.96 Å. The Li(2)-O(3) bond length is 2.05 Å. The Li(2)-O(4) bond length is 2.01 Å. 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 two equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. The Mn(1)-O(1) bond length is 2.07 Å. The Mn(1)-O(2) bond length is 2.06 Å. The Mn(1)-O(3) bond length is 2.13 Å. The Mn(1)-O(4) bond length is 2.05 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 four equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with four equivalent Mn(1)O4 tetrahedra. The Si(1)-O(1) bond length is 1.65 Å. The Si(1)-O(2) bond length is 1.66 Å. The Si(1)-O(3) bond length is 1.66 Å. The Si(1)-O(4) bond length is 1.66 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2MnSi trigonal pyramids. In the second O site, O(2) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form corner-sharing OLi2MnSi tetrahedra. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2MnSi tetrahedra. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form a mixture of corner and edge-sharing OLi2MnSi tetrahedra.