Be13Pa crystallizes in the cubic Fm-3c space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded in a cuboctahedral geometry to twelve equivalent Be(2) atoms. In the second Be site, Be(2) is bonded in a 12-coordinate geometry to one Be(1), nine equivalent Be(2), and two equivalent Pa(1) atoms. Pa(1) is bonded in a 24-coordinate geometry to twenty-four equivalent Be(2) atoms.
Be13Pa crystallizes in the cubic Fm-3c space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded in a cuboctahedral geometry to twelve equivalent Be(2) atoms. All Be(1)-Be(2) bond lengths are 2.15 Å. In the second Be site, Be(2) is bonded in a 12-coordinate geometry to one Be(1), nine equivalent Be(2), and two equivalent Pa(1) atoms. There are a spread of Be(2)-Be(2) bond distances ranging from 2.23-2.35 Å. Both Be(2)-Pa(1) bond lengths are 3.00 Å. Pa(1) is bonded in a 24-coordinate geometry to twenty-four equivalent Be(2) atoms.