Ca4CoZn(Si2O7)2 crystallizes in the tetragonal P-4 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(4) atoms. Co(1) is bonded to four equivalent O(3) atoms to form CoO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. Zn(1) is bonded to four equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Zn(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted tetrahedral geometry to two equivalent Ca(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Zn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Co(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Ca(1) and one Si(1) atom.
Ca4CoZn(Si2O7)2 crystallizes in the tetragonal P-4 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(4) atoms. The Ca(1)-O(1) bond length is 2.49 Å. There is one shorter (2.42 Å) and one longer (2.71 Å) Ca(1)-O(2) bond length. There is one shorter (2.41 Å) and one longer (2.70 Å) Ca(1)-O(3) bond length. There are a spread of Ca(1)-O(4) bond distances ranging from 2.46-2.77 Å. Co(1) is bonded to four equivalent O(3) atoms to form CoO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. All Co(1)-O(3) bond lengths are 1.96 Å. Zn(1) is bonded to four equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. All Zn(1)-O(2) bond lengths are 1.96 Å. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra,  a cornercorner with one Zn(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The Si(1)-O(1) bond length is 1.68 Å. The Si(1)-O(2) bond length is 1.64 Å. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.61 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted tetrahedral geometry to two equivalent Ca(1) and two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Zn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Co(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Ca(1) and one Si(1) atom.