"Lanthanum and cerium are used in the largest volumes; they are needed for a wider variety of industrial uses." There aren't many publicly traded companies producing rare earth elements outside of ...
According to the USGS, “The rare earths are relatively abundant 17 elements composed of scandium, yttrium, and the lanthanides." Scandium Yttrium Lanthanum Cerium Praseodymium Neodymium ...