Wearie-Phelan Bubbles

In the Weaire-Phelan packing, two irregular pentagonal dodecahedra (12-sided) and six tetrakaidecahedra (14-sided) form a translation unit with a lattice periodicity which is simple cubic. Another way to visualise the packing is to note that the hexagonal faces of the tetrakaidecahedra meet to stack them in in long rods. By popular request, here are vertex coordinates for the two polyhedra:

Since it has flat faces, the Frank-Kasper phase is better suited to making card models.

Source: www.steelpillow.com