Li2Co(SiO3)2 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent O(4) atoms. Co(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form CoO4 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 Co(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 in a distorted bent 120 degrees geometry to two equivalent Li(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded to two equivalent Li(1), one Co(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2CoSi trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Li(1), one Co(1), and one Si(1) atom.
Li2Co(SiO3)2 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent O(4) atoms. The Li(1)-O(1) bond length is 2.46 Å. There is one shorter (2.01 Å) and one longer (2.06 Å) Li(1)-O(3) bond length. There is one shorter (1.99 Å) and one longer (2.62 Å) Li(1)-O(4) bond length. Co(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form CoO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. Both Co(1)-O(3) bond lengths are 2.03 Å. Both Co(1)-O(4) bond lengths are 1.99 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 Co(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. The Si(1)-O(1) bond length is 1.67 Å. The Si(1)-O(2) bond length is 1.63 Å. The Si(1)-O(3) bond length is 1.64 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 in a distorted bent 120 degrees geometry to two equivalent Li(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded to two equivalent Li(1), one Co(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2CoSi trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Li(1), one Co(1), and one Si(1) atom.