IN SUMMARY
Rare earth elements are the unsung enablers of modern technology, found in the high-strength magnets that drive electric vehicle motors and wind turbine generators. Despite the name, they are relatively abundant in the Earth's crust; the challenge is that their concentrations are low, making them hard to mine economically, and their production is chemically intensive and geographically concentrated. This guide, the first in Minviro's "Explore the Elements" series, introduces what REEs are, how they are produced, why they are considered critical materials, and why life cycle assessment is essential to understanding their environmental footprint.
REEs are 17 elements with outsized importance. The 15 lanthanides plus scandium and yttrium have unique magnetic, luminescent and electrochemical properties, with permanent magnets (using neodymium, samarium and dysprosium) among their most critical applications.
Supply is highly concentrated. China dominates both REE production and processing, with the US and Australia (and companies like Lynas) as other key contributors, raising supply security concerns that drive efforts to diversify.
Production carries real environmental risks. Many deposits contain radioactive thorium and uranium requiring careful waste management, and chemical processing can release harmful substances, which is why LCA matters for the sector.
What rare earth elements are, and why they matter
Rare earth elements encompass 17 chemical elements: the 15 lanthanides plus scandium and yttrium. The "rare" label is misleading, since they are relatively abundant in the Earth's crust, but they rarely occur in concentrated form, which makes economic extraction difficult. Their value lies in a distinctive set of magnetic, luminescent and electrochemical properties that make them invaluable across modern technology, from consumer electronics to critical defence systems. Their single most significant use is in permanent magnets, which hold a magnetic field without an external power source. Elements like neodymium, samarium and dysprosium are essential to high-strength permanent magnets, which in turn are central to electric vehicle motors, wind turbine generators, hard disk drives and medical devices, directly underpinning the performance of clean-energy technologies.
Geology and production routes
REE geology is complex because the elements tend to occur together in mineral deposits. The main commercial sources are carbonatites (found globally and often linked to alkaline igneous activity), the minerals bastnäsite and monazite (valued for their relatively high REE content), and ion-adsorption clay deposits, which are a crucial source of heavy REEs and are predominantly exploited in southern China and Myanmar because of their more straightforward extraction. Production is then a chemically intensive, multi-stage process: mining, followed by separation and refining to isolate and purify individual elements. That separation is especially challenging because REEs share such similar chemical properties, requiring techniques like solvent extraction, ion exchange and electrolysis. Every step needs careful management to keep environmental impacts and inefficiencies in check.