Ulexite is a hydrous borate mineral (NaCaB₅O₆(OH)₆_5H₂O) with unique optical properties. If you put a specimen of polished ulexite on top of a picture, the picture appears as if it is on top of the rock. The same thing works with words, because you can actually read through a ulexite crystal! Ulexite is referred to as the "TV Rock," because of these properties.

Ulexite naturally occurs as very thin, needle-like crystals. Each crystal acts like a fiber optic cable, as it easily transmits undistorted light waves from one end of the crystal to the other. Scientists discovered the reason that ulexite has this property is due to boron. This discovery helped to develop fiber optic cable that allows light to be transmitted. The use of fiber optics have silently changed how the world communicates. Before its discovery sound was send over copper wires as sound waves. Sound today can be converted by the telephone and fax machines into light waves. Light can travel much faster than sound, so the lines of communication are much clearer.