Quasicrystals And Geometry Access

Quasicrystals: The Geometry That "Shouldn't Exist" For centuries, crystallography was governed by a simple rule: crystals must be periodic. Like tiles on a bathroom floor, their atoms had to arrange themselves in repeating, symmetrical patterns. However, in 1982, Dan Shechtman discovered a material that shattered this definition, earning him the 2011 Nobel Prize in Chemistry. These materials are known as . 1. Breaking the Rules of Symmetry

In classical geometry, you can tile a flat surface perfectly using triangles, squares, or hexagons. However, you cannot tile a floor using only regular pentagons; gaps will always appear. Because of this, scientists believed crystals could only have 2-, 3-, 4-, or 6-fold rotational symmetry. Quasicrystals and Geometry

Their intricate, star-like patterns have influenced architecture and art, echoing designs found in medieval Islamic Girih tiles , which unknowingly used quasicrystalline geometry 500 years before Western science "discovered" it. These materials are known as

The geometric foundation of quasicrystals was actually discovered in pure mathematics before it was found in nature. In the 1970s, Roger Penrose created . By using just two different diamond-shaped tiles, he proved it was possible to cover an infinite plane in a pattern that: Never repeats (aperiodic). Maintains a specific "long-range" order. Relies on the Golden Ratio ( ) to determine the frequency and placement of the tiles. However, you cannot tile a floor using only

They are used as coatings for non-stick frying pans and surgical tools.