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GeC is Zincblende, Sphalerite structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Ge4+ is bonded to four equivalent C4- atoms to form corner-sharing GeC4 tetrahedra. All Ge–C bond lengths are 1.99 Å. C4- is bonded to four equivalent Ge4+ atoms to form corner-sharing CGe4 tetrahedra.
GeC is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ge4+ is bonded to six equivalent C4- atoms to form a mixture of edge and corner-sharing GeC6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Ge–C bond lengths are 2.19 Å. C4- is bonded to six equivalent Ge4+ atoms to form a mixture of edge and corner-sharing CGe6 octahedra. The corner-sharing octahedral tilt angles are 0°.