Li2Cr2O7 crystallizes in the monoclinic C2/c space group. Li(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form LiO5 trigonal bipyramids that share corners with five equivalent Cr(1)O4 tetrahedra and edges with two equivalent Li(1)O5 trigonal bipyramids. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra and corners with five equivalent Li(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Li(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Li(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Li(1) and one Cr(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Cr(1) atoms.
Li2Cr2O7 crystallizes in the monoclinic C2/c space group. Li(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form LiO5 trigonal bipyramids that share corners with five equivalent Cr(1)O4 tetrahedra and edges with two equivalent Li(1)O5 trigonal bipyramids. The Li(1)-O(1) bond length is 1.98 Å. There is one shorter (1.98 Å) and one longer (2.11 Å) Li(1)-O(2) bond length. There is one shorter (2.00 Å) and one longer (2.09 Å) Li(1)-O(3) bond length. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra and corners with five equivalent Li(1)O5 trigonal bipyramids. The Cr(1)-O(1) bond length is 1.61 Å. The Cr(1)-O(2) bond length is 1.62 Å. The Cr(1)-O(3) bond length is 1.63 Å. The Cr(1)-O(4) bond length is 1.75 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Li(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Li(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Li(1) and one Cr(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Cr(1) atoms.