article_snippet: A crystal with a ‘forbidden symmetry’ that was once thought to be impossible to form naturally has been found.
article_snippet: But five-sided pentagons or 10-sided decagons laid next to each will result in gaps between tiles.
article_snippet: This type of structure is impossible in ordinary crystals, in which atoms are packed closely together in a repeated and orderly fashion, earning it the ‘forbidden symmetry’ moniker.
article_snippet: ‘a structure that resembles flat 10-sided disks stacked in a column is saying '”I am not a crystal, but on the other hand, I am not random either,
article_snippet: Crystals with these ‘forbidden symmetries’ had been created in the laboratory, but it wasn't until 2009 that ’
highlights_snippet: Crystal has a symmetry in which Crystal shouldn't be possible for atoms to form .
  