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EuGa2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Eu is bonded to twelve equivalent Ga atoms to form a mixture of edge and face-sharing EuGa12 cuboctahedra. All Eu–Ga bond lengths are 3.36 Å. Ga is bonded in a 9-coordinate geometry to six equivalent Eu and three equivalent Ga atoms. All Ga–Ga bond lengths are 2.50 Å.
EuGa2 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to twelve equivalent Ga atoms. There are a spread of Eu–Ga bond distances ranging from 3.15–3.43 Å. Ga is bonded in a 10-coordinate geometry to six equivalent Eu and four equivalent Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.66–2.83 Å.