Uses: used in making Terfenol-D (military uses in naval sonar systems), doping magnets which are used in hybrid cars (the terbium acts to maintain the magnet field in high temperature environments). Terbium is also used as the green colour in fluorescent lighting and LCD screens.

Terbium is a silvery, heavy rare earth element that is soft enough to cut with a knife. It is also relatively scarce in the distribution of rare earth oxide and is currently the highest valued element in the lanthanides because of its unique properties and small supply side response capacity.