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.

Resources

 * "The crystal gazer" by R. Ramachandran (frontline.in) &mdash; introduction to quasicrystals and Shechtman