Li3Mn2(SiO4)2 is Clathrate-derived structured and crystallizes in the monoclinic P2_1 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form LiO4 tetrahedra that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Mn(2)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form LiO4 tetrahedra that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Mn(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Mn(1)O4 tetrahedra. In the third Li site, Li(3) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Mn(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Mn(1)O4 tetrahedra. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form MnO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Li(3)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form MnO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, 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 Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with two equivalent Mn(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with two equivalent Mn(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Li(2), one Mn(2), and one Si(1) atom. In the second O site, O(2) is bonded to one Li(1), one Li(3), one Mn(2), and one Si(1) atom to form distorted corner-sharing OLi2MnSi tetrahedra. 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 to one Li(2), one Li(3), one Mn(1), and one Si(1) atom to form a mixture of distorted edge and corner-sharing OLi2MnSi trigonal pyramids. In the fifth O site, O(5) is bonded to one Li(1), one Li(3), one Mn(1), and one Si(2) atom to form a mixture of distorted edge and corner-sharing OLi2MnSi trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(2), one Mn(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Mn(2), and one Si(2) atom. In the eighth O site, O(8) is bonded to one Li(2), one Li(3), one Mn(2), and one Si(2) atom to form distorted corner-sharing OLi2MnSi tetrahedra.
Li3Mn2(SiO4)2 is Clathrate-derived structured and crystallizes in the monoclinic P2_1 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form LiO4 tetrahedra that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Mn(2)O4 tetrahedra. The Li(1)-O(2) bond length is 2.09 Å. The Li(1)-O(3) bond length is 2.00 Å. The Li(1)-O(5) bond length is 2.05 Å. The Li(1)-O(7) bond length is 1.93 Å. In the second Li site, Li(2) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form LiO4 tetrahedra that share corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Mn(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Mn(1)O4 tetrahedra. The Li(2)-O(1) bond length is 1.88 Å. The Li(2)-O(4) bond length is 2.03 Å. The Li(2)-O(6) bond length is 2.09 Å. The Li(2)-O(8) bond length is 1.98 Å. In the third Li site, Li(3) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Mn(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Mn(1)O4 tetrahedra. The Li(3)-O(2) bond length is 1.94 Å. The Li(3)-O(4) bond length is 1.99 Å. The Li(3)-O(5) bond length is 2.24 Å. The Li(3)-O(8) bond length is 1.94 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form MnO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Li(3)O4 tetrahedra. The Mn(1)-O(3) bond length is 1.91 Å. The Mn(1)-O(4) bond length is 2.00 Å. The Mn(1)-O(5) bond length is 1.97 Å. The Mn(1)-O(6) bond length is 1.89 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form MnO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. The Mn(2)-O(1) bond length is 2.00 Å. The Mn(2)-O(2) bond length is 2.08 Å. The Mn(2)-O(7) bond length is 2.09 Å. The Mn(2)-O(8) bond length is 2.13 Å. There are two inequivalent Si sites. In the first Si site, 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 Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with two equivalent Mn(2)O4 tetrahedra. The Si(1)-O(1) bond length is 1.62 Å. The Si(1)-O(2) bond length is 1.65 Å. The Si(1)-O(3) bond length is 1.65 Å. The Si(1)-O(4) bond length is 1.68 Å. In the second Si site, Si(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with two equivalent Mn(2)O4 tetrahedra. The Si(2)-O(5) bond length is 1.69 Å. The Si(2)-O(6) bond length is 1.67 Å. The Si(2)-O(7) bond length is 1.61 Å. The Si(2)-O(8) bond length is 1.65 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Li(2), one Mn(2), and one Si(1) atom. In the second O site, O(2) is bonded to one Li(1), one Li(3), one Mn(2), and one Si(1) atom to form distorted corner-sharing OLi2MnSi tetrahedra. 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 to one Li(2), one Li(3), one Mn(1), and one Si(1) atom to form a mixture of distorted edge and corner-sharing OLi2MnSi trigonal pyramids. In the fifth O site, O(5) is bonded to one Li(1), one Li(3), one Mn(1), and one Si(2) atom to form a mixture of distorted edge and corner-sharing OLi2MnSi trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(2), one Mn(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Mn(2), and one Si(2) atom. In the eighth O site, O(8) is bonded to one Li(2), one Li(3), one Mn(2), and one Si(2) atom to form distorted corner-sharing OLi2MnSi tetrahedra.