K8CaTe6 crystallizes in the tetragonal I-42m space group. K(1) is bonded in a 6-coordinate geometry to two equivalent Te(2) and four equivalent Te(1) atoms. Ca(1) is bonded in a distorted tetrahedral geometry to four equivalent Te(1) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 9-coordinate geometry to eight equivalent K(1) and one Ca(1) atom. In the second Te site, Te(2) is bonded in a 10-coordinate geometry to eight equivalent K(1) and two equivalent Te(2) atoms.
K8CaTe6 crystallizes in the tetragonal I-42m space group. K(1) is bonded in a 6-coordinate geometry to two equivalent Te(2) and four equivalent Te(1) atoms. There is one shorter (3.59 Å) and one longer (3.60 Å) K(1)-Te(2) bond length. There are a spread of K(1)-Te(1) bond distances ranging from 3.64-3.78 Å. Ca(1) is bonded in a distorted tetrahedral geometry to four equivalent Te(1) atoms. All Ca(1)-Te(1) bond lengths are 3.18 Å. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 9-coordinate geometry to eight equivalent K(1) and one Ca(1) atom. In the second Te site, Te(2) is bonded in a 10-coordinate geometry to eight equivalent K(1) and two equivalent Te(2) atoms. Both Te(2)-Te(2) bond lengths are 3.16 Å.