Terbium (Tb)

Terbium metal ingot - one troy ounce - .995 bullion   Discovered in Sweden in 1843 by chemist Carl Gustaf Mosander, terbium is a malleable, ductile, silvery white rare earth metal. It is never found as a free element in nature, but is contained as a small component in several minerals including monazite and euxenite where its concentration varies between 0.03% and 1%. Terbium, along with iron and dysprosium make up Terfenol-D which expands and contracts in a magnetic field more than any other metal. It is used in solid state electronics, florescent lamps, trichromatic lighting, TV tubes, fuel cells, and sonar systems. The vast majority of terbium is mined in China and it, along with the other rare earth metals, sit atop of the British Geologic Survey's risk list. Inscribed on our ingots are the chemical symbol (Tb), purity (99.5%), weight (one troy ounce), and a serial number (this number is unique and will vary). On the reverse is our logo. These ingots are lightly polished, simila