CaCr(GeO3)2 is Esseneite structured and crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms. Cr(1) is bonded to one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form CrO6 octahedra that share corners with three equivalent Ge(1)O4 tetrahedra, corners with three equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Cr(1)O6 octahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GeO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-59°. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom 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 43-63°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Ge(1), and one Ge(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(1), one Ge(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Cr(1), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Cr(1), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Cr(1), and one Ge(1) atom. In the sixth O site, O(6) is bonded to one Ca(1), two equivalent Cr(1), and one Ge(2) atom to form distorted edge-sharing OCaCr2Ge tetrahedra.
CaCr(GeO3)2 is Esseneite structured and crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms. The Ca(1)-O(3) bond length is 2.31 Å. The Ca(1)-O(4) bond length is 2.36 Å. The Ca(1)-O(5) bond length is 2.55 Å. The Ca(1)-O(6) bond length is 2.36 Å. There is one shorter (2.75 Å) and one longer (2.77 Å) Ca(1)-O(1) bond length. There is one shorter (2.54 Å) and one longer (2.96 Å) Ca(1)-O(2) bond length. Cr(1) is bonded to one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form CrO6 octahedra that share corners with three equivalent Ge(1)O4 tetrahedra, corners with three equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Cr(1)O6 octahedra. The Cr(1)-O(3) bond length is 2.29 Å. The Cr(1)-O(4) bond length is 2.09 Å. There is one shorter (2.11 Å) and one longer (2.17 Å) Cr(1)-O(5) bond length. There is one shorter (2.09 Å) and one longer (2.46 Å) Cr(1)-O(6) bond length. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GeO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-59°. The Ge(1)-O(1) bond length is 1.83 Å. The Ge(1)-O(2) bond length is 1.81 Å. The Ge(1)-O(4) bond length is 1.74 Å. The Ge(1)-O(5) bond length is 1.77 Å. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom 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 43-63°. The Ge(2)-O(1) bond length is 1.83 Å. The Ge(2)-O(2) bond length is 1.86 Å. The Ge(2)-O(3) bond length is 1.72 Å. The Ge(2)-O(6) bond length is 1.75 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Ge(1), and one Ge(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(1), one Ge(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Cr(1), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Cr(1), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Cr(1), and one Ge(1) atom. In the sixth O site, O(6) is bonded to one Ca(1), two equivalent Cr(1), and one Ge(2) atom to form distorted edge-sharing OCaCr2Ge tetrahedra.