Li2Mn3Si3O10 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-70°. In the second Mn site, Mn(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-70°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. In the second Si site, Si(2) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-65°. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Mn(1), and one Si(2) atom to form distorted OLi2MnSi tetrahedra that share  a cornercorner with one O(1)Li2MnSi tetrahedra, corners with three equivalent O(3)LiMn2Si tetrahedra, and  an edgeedge with one O(1)Li2MnSi tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Mn(1), one Si(1), and one Si(2) atom. In the third O site, O(3) is bonded to one Li(1), one Mn(1), one Mn(2), and one Si(1) atom to form distorted OLiMn2Si tetrahedra that share  a cornercorner with one O(3)LiMn2Si tetrahedra and corners with three equivalent O(1)Li2MnSi tetrahedra. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Li(1), one Mn(1), one Mn(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mn(2), two equivalent Mn(1), and one Si(1) atom.
Li2Mn3Si3O10 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. The Li(1)-O(2) bond length is 2.54 Å. The Li(1)-O(3) bond length is 1.99 Å. The Li(1)-O(4) bond length is 2.31 Å. There is one shorter (1.98 Å) and one longer (2.22 Å) Li(1)-O(1) bond length. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-70°. The Mn(1)-O(1) bond length is 2.23 Å. The Mn(1)-O(2) bond length is 2.51 Å. The Mn(1)-O(3) bond length is 2.26 Å. The Mn(1)-O(4) bond length is 2.12 Å. There is one shorter (2.18 Å) and one longer (2.35 Å) Mn(1)-O(5) bond length. In the second Mn site, Mn(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-70°. Both Mn(2)-O(3) bond lengths are 2.19 Å. Both Mn(2)-O(4) bond lengths are 2.25 Å. Both Mn(2)-O(5) bond lengths are 2.24 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-62°. The Si(1)-O(2) bond length is 1.68 Å. The Si(1)-O(3) bond length is 1.63 Å. The Si(1)-O(4) bond length is 1.64 Å. The Si(1)-O(5) bond length is 1.65 Å. In the second Si site, Si(2) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-65°. Both Si(2)-O(1) bond lengths are 1.63 Å. Both Si(2)-O(2) bond lengths are 1.68 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Mn(1), and one Si(2) atom to form distorted OLi2MnSi tetrahedra that share  a cornercorner with one O(1)Li2MnSi tetrahedra, corners with three equivalent O(3)LiMn2Si tetrahedra, and  an edgeedge with one O(1)Li2MnSi tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Mn(1), one Si(1), and one Si(2) atom. In the third O site, O(3) is bonded to one Li(1), one Mn(1), one Mn(2), and one Si(1) atom to form distorted OLiMn2Si tetrahedra that share  a cornercorner with one O(3)LiMn2Si tetrahedra and corners with three equivalent O(1)Li2MnSi tetrahedra. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Li(1), one Mn(1), one Mn(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mn(2), two equivalent Mn(1), and one Si(1) atom.