This mineral is a natural fiber optic and so is frequently referred to as the "TV rock” or "television stone" for its ability to transmit images. It was named after George Ludwig Ulex, a German chemist, who first correctly analyzed the species. It was discovered in 1850 and is found in arid regions such as salt playas and desiccated saline lakes.

Mineral Photos courtesy of R.Weller/Cochise College