ErGa3 crystallizes in the hexagonal P6_3/mmc space group. Er(1) is bonded to twelve equivalent Ga(1) atoms to form a mixture of distorted face and corner-sharing ErGa12 cuboctahedra. Ga(1) is bonded in a 10-coordinate geometry to four equivalent Er(1) and six equivalent Ga(1) atoms.
ErGa3 crystallizes in the hexagonal P6_3/mmc space group. Er(1) is bonded to twelve equivalent Ga(1) atoms to form a mixture of distorted face and corner-sharing ErGa12 cuboctahedra. There are six shorter (3.00 Å) and six longer (3.10 Å) Er(1)-Ga(1) bond lengths. Ga(1) is bonded in a 10-coordinate geometry to four equivalent Er(1) and six equivalent Ga(1) atoms. There are two shorter (2.73 Å) and four longer (2.74 Å) Ga(1)-Ga(1) bond lengths.