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The seventeen, and what they actually do
Rare earths are not a synonym for magnets. Magnets are maybe a third of the volume and most of the attention. The rest goes into catalysts, phosphors, lasers, jet engine coatings, MRI machines and the fiber optic backbone of the internet.
Last updated 2 August 2026 · Click any element for detail
The balance problem. The thing that makes this whole sector hard
You cannot mine neodymium. You mine ore that contains all of them at once, in whatever ratio the geology decided. Bayan Obo ore is roughly half cerium and a quarter lanthanum. Neodymium, the element everyone actually wants, is a minority of what comes out of the ground.
So to produce enough Nd and Pr for magnets, you must overproduce lanthanum and cerium by a wide margin. Those markets are already saturated, so the surplus depresses their price, and the economics of the whole mine end up resting on a fraction of its output. Meanwhile dysprosium and terbium, needed in small quantities but genuinely scarce, barely appear in most light REE deposits at all.
This is why "just open more mines" does not solve the heavy rare earth shortage. More light REE mines produce more surplus cerium and almost no dysprosium. It's also why recycling makes so much sense: magnet swarf and end-of-life motors are already enriched in exactly the elements that are scarce, with none of the balance penalty.
On the classification. "Light" and "heavy" split at roughly samarium by atomic number, though the industry line moves depending on who's drawing it. Yttrium sits with the heavies by chemistry despite being much lighter, and scandium is grouped with rare earths by convention rather than chemistry. Promethium has no stable isotope and effectively no commercial market. It's here for completeness.
Where this is thin. Volume and price figures move fast and I've kept them out rather than publish numbers that will be wrong in a quarter. The adjacent critical minerals section covers only the ones with an active export-control or defense-sourcing angle, not the full USGS list.
Research and opinion. Not investment, financial, or legal advice. · Matt Stone · Thinking about selling? · matt@stonehammer.ai