Where are Rare Earth Elements Found? - Advancing Mining
According to the USGS Rare Earths Report, the principal economic sources of rare earths are the minerals bastnasite, monazite, and loparite and the lateritic ion-adsorption clays. The elements range in crustal abundance from cerium, the 25th most abundant element of the 78 common elements in the Earth's crust at 60 parts per million, to ...