Chameleons change color by tuning photonic crystal-like structures in their skin. See photos.
A new material synthesized by researchers could gather oxygen from the water around you.
Giant gypsum crystals -- some of which are in excess of 30 feet long and half a million years old -- are found deep within the Naica mine in Chihuahua, Mexico and are renowned for their spectacular beauty.
Shining a laser on tiny particles suspended in a fluid causes the them to rearrange themselves.
A crystal uncovered in a British shipwreck could help prove Vikings used so-called 'sunstone' to find their way under less-than-sunny skies.