Li2Cr(SiO3)2 crystallizes in the orthorhombic Fdd2 space group. Li(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted LiO4 trigonal pyramids that share corners with three equivalent Cr(1)O4 tetrahedra, corners with five equivalent Si(1)O4 tetrahedra, and corners with two equivalent Li(1)O4 trigonal pyramids. Cr(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form CrO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra and corners with six equivalent Li(1)O4 trigonal pyramids. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Cr(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with five equivalent Li(1)O4 trigonal pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(1), one Cr(1), and one Si(1) atom. In the second O site, O(2) is bonded to two equivalent Li(1), one Cr(1), and one Si(1) atom to form distorted corner-sharing OLi2CrSi tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1) and two equivalent Si(1) atoms.
Li2Cr(SiO3)2 crystallizes in the orthorhombic Fdd2 space group. Li(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted LiO4 trigonal pyramids that share corners with three equivalent Cr(1)O4 tetrahedra, corners with five equivalent Si(1)O4 tetrahedra, and corners with two equivalent Li(1)O4 trigonal pyramids. The Li(1)-O(1) bond length is 2.06 Å. The Li(1)-O(3) bond length is 2.23 Å. There is one shorter (1.90 Å) and one longer (2.13 Å) Li(1)-O(2) bond length. Cr(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form CrO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra and corners with six equivalent Li(1)O4 trigonal pyramids. Both Cr(1)-O(1) bond lengths are 2.15 Å. Both Cr(1)-O(2) bond lengths are 2.07 Å. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Cr(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with five equivalent Li(1)O4 trigonal pyramids. The Si(1)-O(1) bond length is 1.61 Å. The Si(1)-O(2) bond length is 1.64 Å. There is one shorter (1.64 Å) and one longer (1.68 Å) Si(1)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(1), one Cr(1), and one Si(1) atom. In the second O site, O(2) is bonded to two equivalent Li(1), one Cr(1), and one Si(1) atom to form distorted corner-sharing OLi2CrSi tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1) and two equivalent Si(1) atoms.