LaSe3 crystallizes in the hexagonal P6_3/mmc space group. La(1) is bonded to twelve equivalent Se(1) atoms to form a mixture of face and corner-sharing LaSe12 cuboctahedra. Se(1) is bonded in a 6-coordinate geometry to four equivalent La(1) and two equivalent Se(1) atoms.
LaSe3 crystallizes in the hexagonal P6_3/mmc space group. La(1) is bonded to twelve equivalent Se(1) atoms to form a mixture of face and corner-sharing LaSe12 cuboctahedra. There are six shorter (3.05 Å) and six longer (3.47 Å) La(1)-Se(1) bond lengths. Se(1) is bonded in a 6-coordinate geometry to four equivalent La(1) and two equivalent Se(1) atoms. Both Se(1)-Se(1) bond lengths are 2.92 Å.