Best ever at splitting light, new material could improve LEDs, solar cells, optical sensors
(PHYSorg.com Physics)

Place a chunk of the clear mineral Iceland spar on top of an image and suddenly you`ll see double, thanks to a phenomenon called double refraction-a result of a quality of the crystal material called optical anisotropy. Beyond just a nifty trick, materials with optical anisotropy are vital for a variety of devices such as lasers, liquid-crystal displays, lens filters and microscopes.