CaHo2Cu(SiO3)4 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent Cu(1), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. Ho(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(3), and two equivalent O(6) atoms. Cu(1) is bonded in a 6-coordinate geometry to two equivalent Ca(1), two equivalent O(1), and two equivalent O(4) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form corner-sharing SiO4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ho(1), one Cu(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ca(1), one Si(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Ho(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ho(1), one Cu(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Ho(1) and one Si(2) atom.
CaHo2Cu(SiO3)4 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent Cu(1), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. Both Ca(1)-Cu(1) bond lengths are 2.62 Å. Both Ca(1)-O(1) bond lengths are 2.32 Å. Both Ca(1)-O(2) bond lengths are 2.46 Å. Both Ca(1)-O(4) bond lengths are 2.30 Å. Ho(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(3), and two equivalent O(6) atoms. The Ho(1)-O(1) bond length is 2.24 Å. The Ho(1)-O(4) bond length is 2.23 Å. There is one shorter (2.31 Å) and one longer (2.46 Å) Ho(1)-O(3) bond length. There is one shorter (2.30 Å) and one longer (2.55 Å) Ho(1)-O(6) bond length. Cu(1) is bonded in a 6-coordinate geometry to two equivalent Ca(1), two equivalent O(1), and two equivalent O(4) atoms. Both Cu(1)-O(1) bond lengths are 2.54 Å. Both Cu(1)-O(4) bond lengths are 2.56 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing SiO4 tetrahedra. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(2) bond length is 1.68 Å. The Si(1)-O(3) bond length is 1.63 Å. The Si(1)-O(5) bond length is 1.64 Å. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form corner-sharing SiO4 tetrahedra. The Si(2)-O(2) bond length is 1.69 Å. The Si(2)-O(4) bond length is 1.63 Å. The Si(2)-O(5) bond length is 1.65 Å. The Si(2)-O(6) bond length is 1.63 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ho(1), one Cu(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ca(1), one Si(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Ho(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ho(1), one Cu(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Ho(1) and one Si(2) atom.