Ulexite is also refered to as Television Stone, why is that?

Ulexite’s fibers act as natural optical light pipes—similar to fiber-optic cables. When you place a piece of well-polished fibrous ulexite over text or an image, it transmits the image to the surface, making it appear as if the picture is printed on the stone itself. This effect comes from total internal reflection along the aligned borate fibers.

Ulexite forms in evaporite environments, especially in the closed-basin deserts of the Western U.S. and South America. It crystallizes from boron-rich brines as they evaporate.

Some ulexite is processed industrially as a boron ore, though colemanite and kernite are more common borate sources.

Over on the shelf with the rocks you can touch, you will find a piece of Ulexite - place it agaisnt different materials to observe the optical effects!