Ca2CrO8 is Zircon-like structured and crystallizes in the monoclinic Cm space group. Ca(1) is bonded to one O(2), one O(3), one O(4), one O(6), two equivalent O(1), and two equivalent O(5) atoms to form distorted CaO8 hexagonal bipyramids that share corners with two equivalent Cr(1)O4 tetrahedra, edges with four equivalent Ca(1)O8 hexagonal bipyramids, and  an edgeedge with one Cr(1)O4 tetrahedra. Cr(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form CrO4 tetrahedra that share corners with four equivalent Ca(1)O8 hexagonal bipyramids and edges with two equivalent Ca(1)O8 hexagonal bipyramids. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca(1) and one Cr(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Ca(1) and one O(6) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Ca(1) and one O(5) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one O(4) atom.
Ca2CrO8 is Zircon-like structured and crystallizes in the monoclinic Cm space group. Ca(1) is bonded to one O(2), one O(3), one O(4), one O(6), two equivalent O(1), and two equivalent O(5) atoms to form distorted CaO8 hexagonal bipyramids that share corners with two equivalent Cr(1)O4 tetrahedra, edges with four equivalent Ca(1)O8 hexagonal bipyramids, and  an edgeedge with one Cr(1)O4 tetrahedra. The Ca(1)-O(2) bond length is 2.42 Å. The Ca(1)-O(3) bond length is 2.42 Å. The Ca(1)-O(4) bond length is 2.61 Å. The Ca(1)-O(6) bond length is 2.58 Å. There is one shorter (2.40 Å) and one longer (2.61 Å) Ca(1)-O(1) bond length. There is one shorter (2.49 Å) and one longer (2.61 Å) Ca(1)-O(5) bond length. Cr(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form CrO4 tetrahedra that share corners with four equivalent Ca(1)O8 hexagonal bipyramids and edges with two equivalent Ca(1)O8 hexagonal bipyramids. The Cr(1)-O(2) bond length is 1.67 Å. The Cr(1)-O(3) bond length is 1.67 Å. Both Cr(1)-O(1) bond lengths are 1.65 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca(1) and one Cr(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Ca(1) and one O(6) atom. The O(4)-O(6) bond length is 1.34 Å. In the fifth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Ca(1) and one O(5) atom. The O(5)-O(5) bond length is 1.34 Å. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one O(4) atom.