Mg3Tl is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Mg(1) is bonded to eight equivalent Mg(1) and four equivalent Tl(1) atoms to form MgMg8Tl4 cuboctahedra that share corners with twelve equivalent Mg(1)Mg8Tl4 cuboctahedra, edges with eight equivalent Tl(1)Mg12 cuboctahedra, edges with sixteen equivalent Mg(1)Mg8Tl4 cuboctahedra, faces with four equivalent Tl(1)Mg12 cuboctahedra, and faces with fourteen equivalent Mg(1)Mg8Tl4 cuboctahedra. Tl(1) is bonded to twelve equivalent Mg(1) atoms to form TlMg12 cuboctahedra that share corners with twelve equivalent Tl(1)Mg12 cuboctahedra, edges with twenty-four equivalent Mg(1)Mg8Tl4 cuboctahedra, faces with six equivalent Tl(1)Mg12 cuboctahedra, and faces with twelve equivalent Mg(1)Mg8Tl4 cuboctahedra.
Mg3Tl is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Mg(1) is bonded to eight equivalent Mg(1) and four equivalent Tl(1) atoms to form MgMg8Tl4 cuboctahedra that share corners with twelve equivalent Mg(1)Mg8Tl4 cuboctahedra, edges with eight equivalent Tl(1)Mg12 cuboctahedra, edges with sixteen equivalent Mg(1)Mg8Tl4 cuboctahedra, faces with four equivalent Tl(1)Mg12 cuboctahedra, and faces with fourteen equivalent Mg(1)Mg8Tl4 cuboctahedra. All Mg(1)-Mg(1) bond lengths are 3.16 Å. All Mg(1)-Tl(1) bond lengths are 3.16 Å. Tl(1) is bonded to twelve equivalent Mg(1) atoms to form TlMg12 cuboctahedra that share corners with twelve equivalent Tl(1)Mg12 cuboctahedra, edges with twenty-four equivalent Mg(1)Mg8Tl4 cuboctahedra, faces with six equivalent Tl(1)Mg12 cuboctahedra, and faces with twelve equivalent Mg(1)Mg8Tl4 cuboctahedra.