CoGe is Modderite-like structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 10-coordinate geometry to two equivalent Co(2), two equivalent Co(3), two equivalent Ge(1), and four equivalent Ge(2) atoms. In the second Co site, Co(2) is bonded in a 10-coordinate geometry to two equivalent Co(1), two equivalent Co(3), two equivalent Ge(1), and four equivalent Ge(2) atoms. In the third Co site, Co(3) is bonded in a 6-coordinate geometry to one Co(1), one Co(2), two equivalent Ge(2), and four equivalent Ge(1) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 6-coordinate geometry to one Co(1), one Co(2), and four equivalent Co(3) atoms. In the second Ge site, Ge(2) is bonded in a 6-coordinate geometry to two equivalent Co(1), two equivalent Co(2), and two equivalent Co(3) atoms.
CoGe is Modderite-like structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 10-coordinate geometry to two equivalent Co(2), two equivalent Co(3), two equivalent Ge(1), and four equivalent Ge(2) atoms. Both Co(1)-Co(2) bond lengths are 2.44 Å. Both Co(1)-Co(3) bond lengths are 2.55 Å. Both Co(1)-Ge(1) bond lengths are 2.44 Å. All Co(1)-Ge(2) bond lengths are 2.37 Å. In the second Co site, Co(2) is bonded in a 10-coordinate geometry to two equivalent Co(1), two equivalent Co(3), two equivalent Ge(1), and four equivalent Ge(2) atoms. Both Co(2)-Co(3) bond lengths are 2.56 Å. Both Co(2)-Ge(1) bond lengths are 2.42 Å. All Co(2)-Ge(2) bond lengths are 2.35 Å. In the third Co site, Co(3) is bonded in a 6-coordinate geometry to one Co(1), one Co(2), two equivalent Ge(2), and four equivalent Ge(1) atoms. Both Co(3)-Ge(2) bond lengths are 2.35 Å. There are a spread of Co(3)-Ge(1) bond distances ranging from 2.43-2.50 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 6-coordinate geometry to one Co(1), one Co(2), and four equivalent Co(3) atoms. In the second Ge site, Ge(2) is bonded in a 6-coordinate geometry to two equivalent Co(1), two equivalent Co(2), and two equivalent Co(3) atoms.