CaCr(GeO3)2 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Cr(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form CrO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra and edges with two equivalent Cr(1)O6 octahedra. Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-61°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1) and two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Cr(1), and one Ge(1) atom. In the third O site, O(3) is bonded to one Ca(1), two equivalent Cr(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OCaCr2Ge tetrahedra.
CaCr(GeO3)2 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Both Ca(1)-O(2) bond lengths are 2.33 Å. Both Ca(1)-O(3) bond lengths are 2.44 Å. There are two shorter (2.69 Å) and two longer (2.82 Å) Ca(1)-O(1) bond lengths. Cr(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form CrO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra and edges with two equivalent Cr(1)O6 octahedra. Both Cr(1)-O(2) bond lengths are 2.19 Å. There are two shorter (2.08 Å) and two longer (2.32 Å) Cr(1)-O(3) bond lengths. Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-61°. The Ge(1)-O(2) bond length is 1.73 Å. The Ge(1)-O(3) bond length is 1.76 Å. There is one shorter (1.82 Å) and one longer (1.84 Å) Ge(1)-O(1) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1) and two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Cr(1), and one Ge(1) atom. In the third O site, O(3) is bonded to one Ca(1), two equivalent Cr(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OCaCr2Ge tetrahedra.