Marco Rubio Knows America's Future Depends On Rare Elements
May 21, 2010 · "Rare earth" stuck, but the elements themselves turned out to be pretty common, mixed in small concentrations into rock the world over. Lanthanum, .Aug 01, 2019 · That usually involves a process of solvent extraction using highly toxic acids, and they can put the materials through these solvent cycles up to 100 times, just to separate all of the rare earths from each other." Governance issues. The complex and sometimes dangerous processing of rare earth materials is one challenge.