PmGa3 crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded to twelve equivalent Ga(1) atoms to form a mixture of distorted face and corner-sharing PmGa12 cuboctahedra. Ga(1) is bonded in a 10-coordinate geometry to four equivalent Pm(1) and six equivalent Ga(1) atoms.
PmGa3 crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded to twelve equivalent Ga(1) atoms to form a mixture of distorted face and corner-sharing PmGa12 cuboctahedra. There are six shorter (3.10 Å) and six longer (3.22 Å) Pm(1)-Ga(1) bond lengths. Ga(1) is bonded in a 10-coordinate geometry to four equivalent Pm(1) and six equivalent Ga(1) atoms. There are two shorter (2.72 Å) and four longer (2.75 Å) Ga(1)-Ga(1) bond lengths.