Quasicrystal



Quasiperiodic crystal (quasicrystal) is crystalline structure that is ordered but aperiodic, having no translational symmetry &mdash; which is to say, non-repeating patterns. Such structure had been described mathematically, including by Roger Penrose, prior to being discovered in nature by Daniel Shechtman.

Reading

 * &mdash; introduction to quasicrystals and Shechtman