Quasicrystals fivefold axis

Figure Bl.8.7. A convergent beam diffraction pattern of the fivefold axis of a quasicrystal, as in figure Bl.8.6. The diffraction rings show that the synnnetry is fivefold, not tenfold. (Courtesy of L Bendersky.)...

Electron diffraction pattern of an AIMn quasicrystal along the fivefold axis (left) and a computed Fourier pattern of a three-dimensional Penrose tiling (right). From C. Janot, Quasicrystals, A Primer, 2nd ed. (London Oxford Univ. Press, 1994), p. 3, figure 1.24. 

---