CaMn2Ge2 crystallizes in the tetragonal I4/mmm space group. Ca(1) is bonded in a 16-coordinate geometry to eight equivalent Mn(1) and eight equivalent Ge(1) atoms. Mn(1) is bonded to four equivalent Ca(1) and four equivalent Ge(1) atoms to form a mixture of face, corner, and edge-sharing MnCa4Ge4 tetrahedra. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), four equivalent Mn(1), and one Ge(1) atom.
CaMn2Ge2 crystallizes in the tetragonal I4/mmm space group. Ca(1) is bonded in a 16-coordinate geometry to eight equivalent Mn(1) and eight equivalent Ge(1) atoms. All Ca(1)-Mn(1) bond lengths are 3.45 Å. All Ca(1)-Ge(1) bond lengths are 3.24 Å. Mn(1) is bonded to four equivalent Ca(1) and four equivalent Ge(1) atoms to form a mixture of face, corner, and edge-sharing MnCa4Ge4 tetrahedra. All Mn(1)-Ge(1) bond lengths are 2.55 Å. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), four equivalent Mn(1), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 2.59 Å.