Cu3(TeO5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted CuO6 octahedra that share corners with two equivalent Cu(2)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, edges with two equivalent Te(1)O6 octahedra, and edges with four equivalent Cu(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-15°. In the second Cu site, Cu(2) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form CuO6 octahedra that share  a cornercorner with one Cu(1)O6 octahedra, edges with two equivalent Cu(1)O6 octahedra, edges with two equivalent Cu(2)O6 octahedra, and edges with three equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles are 15°. Te(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form TeO6 octahedra that share  a cornercorner with one Cu(1)O6 octahedra,  an edgeedge with one Cu(1)O6 octahedra,  an edgeedge with one Te(1)O6 octahedra, and edges with three equivalent Cu(2)O6 octahedra. The corner-sharing octahedral tilt angles are 7°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Cu(1), two equivalent Cu(2), and one Te(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Cu(1), two equivalent Cu(2), and one Te(1) atom. In the third O site, O(3) is bonded in a water-like geometry to two equivalent Te(1) atoms. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Te(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Cu(2) and one Te(1) atom.
Cu3(TeO5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted CuO6 octahedra that share corners with two equivalent Cu(2)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, edges with two equivalent Te(1)O6 octahedra, and edges with four equivalent Cu(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-15°. Both Cu(1)-O(1) bond lengths are 2.53 Å. Both Cu(1)-O(2) bond lengths are 1.95 Å. Both Cu(1)-O(4) bond lengths are 1.91 Å. In the second Cu site, Cu(2) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form CuO6 octahedra that share  a cornercorner with one Cu(1)O6 octahedra, edges with two equivalent Cu(1)O6 octahedra, edges with two equivalent Cu(2)O6 octahedra, and edges with three equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles are 15°. The Cu(2)-O(4) bond length is 2.03 Å. The Cu(2)-O(5) bond length is 1.93 Å. There is one shorter (2.04 Å) and one longer (2.06 Å) Cu(2)-O(1) bond length. There is one shorter (2.08 Å) and one longer (2.16 Å) Cu(2)-O(2) bond length. Te(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form TeO6 octahedra that share  a cornercorner with one Cu(1)O6 octahedra,  an edgeedge with one Cu(1)O6 octahedra,  an edgeedge with one Te(1)O6 octahedra, and edges with three equivalent Cu(2)O6 octahedra. The corner-sharing octahedral tilt angles are 7°. The Te(1)-O(1) bond length is 1.97 Å. The Te(1)-O(2) bond length is 2.05 Å. The Te(1)-O(4) bond length is 2.01 Å. The Te(1)-O(5) bond length is 1.88 Å. There is one shorter (1.95 Å) and one longer (2.02 Å) Te(1)-O(3) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Cu(1), two equivalent Cu(2), and one Te(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Cu(1), two equivalent Cu(2), and one Te(1) atom. In the third O site, O(3) is bonded in a water-like geometry to two equivalent Te(1) atoms. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Te(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Cu(2) and one Te(1) atom.