ErAuGa crystallizes in the monoclinic C2/m space group. Er(1) is bonded in a 12-coordinate geometry to six equivalent Au(1) and six equivalent Ga(1) atoms. Au(1) is bonded in a 10-coordinate geometry to six equivalent Er(1), one Au(1), and three equivalent Ga(1) atoms. Ga(1) is bonded in a 10-coordinate geometry to six equivalent Er(1), three equivalent Au(1), and one Ga(1) atom.
ErAuGa crystallizes in the monoclinic C2/m space group. Er(1) is bonded in a 12-coordinate geometry to six equivalent Au(1) and six equivalent Ga(1) atoms. There are a spread of Er(1)-Au(1) bond distances ranging from 3.02-3.23 Å. There are a spread of Er(1)-Ga(1) bond distances ranging from 3.07-3.24 Å. Au(1) is bonded in a 10-coordinate geometry to six equivalent Er(1), one Au(1), and three equivalent Ga(1) atoms. The Au(1)-Au(1) bond length is 2.80 Å. There are two shorter (2.56 Å) and one longer (2.88 Å) Au(1)-Ga(1) bond length. Ga(1) is bonded in a 10-coordinate geometry to six equivalent Er(1), three equivalent Au(1), and one Ga(1) atom. The Ga(1)-Ga(1) bond length is 2.53 Å.