👉 Tellurium is a chemical element with symbol Te and atomic number 20. It is a rare earth metal that has been found in many minerals including peridot, agate, and amethyst. Tellurium is often used as a source of light for scientific research and experiments due to its unique properties such as transparency and high electrical conductivity. Tellurium is also an important element in the production of certain medical devices, particularly those that use it in dental implants or prosthetics