ingredient information
Cerium was discovered in 1803 by both Klaproth and by Berzelius and Hisinger. However, Hillebrand and Hisisnger produced the metal much later in 1875. It is the most abundant of the rare earth metals and is found in a number of minerals, which include allanite (also know as orthite), monazite, bastnasite, cerite and samarskite. Monazite and bastnasite are presently the two most important sources of cerium.