Via Scientific American:

… A team of researchers says it has found in a Russian mineral sample the first natural example of a quasicrystal, an unusual material that displays some of the properties of a crystal but boasts a more intricate and complex structure. Since quasicrystals were characterized 25 years ago, numerous versions have been cooked up in the laboratory, but a natural example would indicate that nature’s products are more diverse than previously thought…The find could force a redefinition of minerals to include such quasicrystals…

More – interview with Nobel Prize winner award to Israelli Chemist for another quasicrystal discovery.