Cu3Si is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Cu(1) is bonded to eight equivalent Cu(1) and four equivalent Si(1) atoms to form CuCu8Si4 cuboctahedra that share corners with four equivalent Si(1)Cu12 cuboctahedra, corners with fourteen equivalent Cu(1)Cu8Si4 cuboctahedra, edges with six equivalent Si(1)Cu12 cuboctahedra, edges with twelve equivalent Cu(1)Cu8Si4 cuboctahedra, faces with four equivalent Si(1)Cu12 cuboctahedra, and faces with sixteen equivalent Cu(1)Cu8Si4 cuboctahedra. Si(1) is bonded to twelve equivalent Cu(1) atoms to form SiCu12 cuboctahedra that share corners with six equivalent Si(1)Cu12 cuboctahedra, corners with twelve equivalent Cu(1)Cu8Si4 cuboctahedra, edges with eighteen equivalent Cu(1)Cu8Si4 cuboctahedra, faces with eight equivalent Si(1)Cu12 cuboctahedra, and faces with twelve equivalent Cu(1)Cu8Si4 cuboctahedra.
Cu3Si is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Cu(1) is bonded to eight equivalent Cu(1) and four equivalent Si(1) atoms to form CuCu8Si4 cuboctahedra that share corners with four equivalent Si(1)Cu12 cuboctahedra, corners with fourteen equivalent Cu(1)Cu8Si4 cuboctahedra, edges with six equivalent Si(1)Cu12 cuboctahedra, edges with twelve equivalent Cu(1)Cu8Si4 cuboctahedra, faces with four equivalent Si(1)Cu12 cuboctahedra, and faces with sixteen equivalent Cu(1)Cu8Si4 cuboctahedra. There are a spread of Cu(1)-Cu(1) bond distances ranging from 2.53-2.59 Å. There are two shorter (2.51 Å) and two longer (2.57 Å) Cu(1)-Si(1) bond lengths. Si(1) is bonded to twelve equivalent Cu(1) atoms to form SiCu12 cuboctahedra that share corners with six equivalent Si(1)Cu12 cuboctahedra, corners with twelve equivalent Cu(1)Cu8Si4 cuboctahedra, edges with eighteen equivalent Cu(1)Cu8Si4 cuboctahedra, faces with eight equivalent Si(1)Cu12 cuboctahedra, and faces with twelve equivalent Cu(1)Cu8Si4 cuboctahedra.