Ga3Ge crystallizes in the hexagonal P6_3/mmc space group. Ga(1) is bonded to eight equivalent Ga(1) and four equivalent Ge(1) atoms to form distorted GaGa8Ge4 cuboctahedra that share corners with four equivalent Ge(1)Ga12 cuboctahedra, corners with fourteen equivalent Ga(1)Ga8Ge4 cuboctahedra, edges with six equivalent Ge(1)Ga12 cuboctahedra, edges with twelve equivalent Ga(1)Ga8Ge4 cuboctahedra, faces with four equivalent Ge(1)Ga12 cuboctahedra, and faces with sixteen equivalent Ga(1)Ga8Ge4 cuboctahedra. Ge(1) is bonded to twelve equivalent Ga(1) atoms to form GeGa12 cuboctahedra that share corners with six equivalent Ge(1)Ga12 cuboctahedra, corners with twelve equivalent Ga(1)Ga8Ge4 cuboctahedra, edges with eighteen equivalent Ga(1)Ga8Ge4 cuboctahedra, faces with eight equivalent Ge(1)Ga12 cuboctahedra, and faces with twelve equivalent Ga(1)Ga8Ge4 cuboctahedra.
Ga3Ge crystallizes in the hexagonal P6_3/mmc space group. Ga(1) is bonded to eight equivalent Ga(1) and four equivalent Ge(1) atoms to form distorted GaGa8Ge4 cuboctahedra that share corners with four equivalent Ge(1)Ga12 cuboctahedra, corners with fourteen equivalent Ga(1)Ga8Ge4 cuboctahedra, edges with six equivalent Ge(1)Ga12 cuboctahedra, edges with twelve equivalent Ga(1)Ga8Ge4 cuboctahedra, faces with four equivalent Ge(1)Ga12 cuboctahedra, and faces with sixteen equivalent Ga(1)Ga8Ge4 cuboctahedra. There are a spread of Ga(1)-Ga(1) bond distances ranging from 2.96-3.10 Å. There are two shorter (2.96 Å) and two longer (3.09 Å) Ga(1)-Ge(1) bond lengths. Ge(1) is bonded to twelve equivalent Ga(1) atoms to form GeGa12 cuboctahedra that share corners with six equivalent Ge(1)Ga12 cuboctahedra, corners with twelve equivalent Ga(1)Ga8Ge4 cuboctahedra, edges with eighteen equivalent Ga(1)Ga8Ge4 cuboctahedra, faces with eight equivalent Ge(1)Ga12 cuboctahedra, and faces with twelve equivalent Ga(1)Ga8Ge4 cuboctahedra.