Rare earth elements rarely attract the attention given to semiconductors, batteries, or artificial intelligence. Yet they sit deep inside many of the technologies that make those industries possible.

Powerful electric motors, wind turbine generators, industrial equipment, consumer electronics, catalysts, specialized glass, and some aerospace and defense systems all rely on rare earths in one form or another. Their importance comes not from the amount of material used, but from the distinctive magnetic, optical, and chemical properties that certain rare earth elements provide.

That combination has made rare earths increasingly important to the modern economy. It has also exposed a difficult supply problem. Mining has expanded beyond China, but the more technically demanding stages of separation, refining, and magnet manufacturing remain heavily concentrated.

Rare earths are a family of 17 chemical elements, consisting of the 15 lanthanides plus scandium and yttrium. Despite their name, many are not especially rare in the Earth’s crust. The U.S. Geological Survey describes rare earths as relatively abundant but notes that deposits containing concentrations suitable for economic extraction are much less common.

Their chemistry creates another challenge. Rare earth elements tend to occur together and have similar chemical properties, which makes separating individual elements from mined material technically difficult. At the same time, differences in their magnetic and physical properties give individual elements very different technological uses.

This is why rare earths should not be treated as a single interchangeable commodity. Neodymium and praseodymium are particularly important for high-performance magnets. Dysprosium and terbium can help magnets retain their performance at higher temperatures. Other rare earths are used in catalysts, glass, polishing materials, batteries, phosphors, and specialized alloys.

The most strategically important use of rare earths today is in permanent magnets.

According to the International Energy Agency, permanent magnets account for about 95% of total rare earth consumption by value. That figure measures economic value rather than physical tonnage, so it does not mean magnets consume 95% of all rare earth material by weight.

Neodymium-iron-boron magnets, commonly known as NdFeB magnets, are among the most powerful permanent magnets commercially available. Their strength allows manufacturers to build motors and generators that deliver substantial power from relatively compact and lightweight equipment.

That makes them particularly useful in electric vehicle traction motors, wind turbines, robotics, industrial motors, and other applications where efficiency, size, and power density matter. The IEA also identifies cars, data centers, and defense systems among the industries that use rare earth permanent magnets.

The key magnet-related rare earths are praseodymium, neodymium, dysprosium, and terbium. The IEA groups these four together when analyzing what it calls magnet rare earths, an important distinction because statistics for these elements do not cover the entire family of 17 rare earth elements.

Magnets are increasingly important, but they are not the only reason rare earths matter.

The USGS identifies catalysts as the leading estimated U.S. end use of rare earths in 2025, while magnets were the leading global use. Other applications included batteries, ceramics and glass, metallurgical uses and alloys, and polishing materials.

Cerium compounds, for example, are used in catalysts and glass polishing. Lanthanum has applications in petroleum refining catalysts. Rare earth compounds are also used where manufacturers need particular optical, electronic, or thermal characteristics that ordinary industrial materials cannot easily provide.

This diversity is important. There is no single technology whose disappearance would eliminate demand for rare earths. Instead, the elements are spread across many parts of the industrial economy, often performing highly specialized functions inside products whose total value is far greater than the value of the rare earth material itself.

Global rare earth mine production reached an estimated 390,000 metric tons of rare-earth-oxide equivalent in 2025, according to the USGS Mineral Commodity Summaries 2026. China accounted for an estimated 270,000 metric tons, or nearly 70% of the worldwide total. The United States produced an estimated 51,000 metric tons. These figures cover the broader rare earth group measured on an REO-equivalent basis and are USGS estimates rather than reported sales or shipments of finished rare earth products.

Mining figures, however, do not fully describe where control of the supply chain lies.

The IEA estimates that in 2024 China produced about 60% of the world's mined magnet rare earths, but accounted for 91% of their refined output and 94% of global production of sintered permanent magnets.

These percentages should not be compared directly with the USGS figure showing China's share of total rare earth mining. The datasets measure different things. The USGS total covers a broader group of rare earth mine production, while the IEA percentages focus specifically on neodymium, praseodymium, dysprosium, and terbium and follow those materials farther downstream into refining and magnet manufacturing.

The distinction helps explain why simply opening new mines does not eliminate supply dependence.

After mining, ores must be concentrated, chemically processed, separated into individual rare earth oxides, refined into metals, converted into alloys or powders, and eventually manufactured into components such as magnets. The IEA describes separation as a technically demanding core stage of the process.

The consequences of that concentration became more visible in 2025.

China imposed export controls in April 2025 covering seven rare earth elements and related materials. The IEA reported that exports of affected rare earth products and magnets fell sharply in the following months, creating sourcing difficulties for manufacturers in the United States, Europe, and elsewhere. Some automakers reduced production rates or temporarily stopped production while supplies were constrained.

The episode demonstrated why rare earths can have an economic impact that is much larger than the size of the minerals market itself. A manufacturer may require only a relatively small quantity of a specialized magnet, but production can still be disrupted if that component is unavailable.

This is one reason governments and manufacturers increasingly focus on the entire mine-to-magnet supply chain rather than simply access to geological deposits.

Electrification and automation are increasing the importance of magnet rare earths.

Under the IEA's current policy settings, demand for magnet rare earths outside China is projected to increase by about 50% by 2035, with electric vehicle deployment providing the largest contribution to that growth. This is a forecast based on the agency's policy and technology assumptions, not a recorded increase that has already occurred.

The challenge is that diversification farther down the supply chain is progressing more slowly than new mining projects.

Based on existing capacity and projects announced by early 2026, the IEA estimates that production outside China would meet only about 50% of projected 2035 demand at the mining stage, 25% at the refining stage, and well below 20% at the magnet manufacturing stage. The analysis specifically covers magnet rare earths and projected demand outside China.

That imbalance shows why rare earth security is as much a manufacturing and processing issue as a mining issue.

Technology companies are not entirely locked into rare earths.

Alternative motor designs, different magnet materials, and changes in product engineering can reduce or eliminate rare earth use in some applications. The USGS notes that substitutes exist for many rare earth applications, although they are generally less effective.

That trade-off matters. Manufacturers choose rare earth materials because they deliver particular combinations of magnetic strength, temperature performance, efficiency, weight, and size. Removing them can therefore require a different engineering approach rather than a simple material swap.

Recycling could also become more important as larger numbers of electric vehicles, wind turbines, and other magnet-containing products reach the end of their useful lives. The IEA expects recycling to contribute more to critical mineral supply over time, including through the recovery of rare earth magnets. It is nevertheless only one part of a broader effort that also includes new mines, processing plants, magnet factories, and material-efficient technologies.

Rare earth elements illustrate a defining feature of modern technology supply chains. A material does not need to be used in enormous quantities to become economically important.

For many applications, a relatively small amount of neodymium, praseodymium, dysprosium, terbium, or another rare earth can provide properties that are difficult to reproduce with ordinary materials. Those properties allow motors to become smaller and more efficient, magnets to remain powerful under demanding conditions, and specialized industrial and electronic products to perform as designed.

Rare earths are critical not because the modern economy consumes them in the same volumes as steel, copper, or aluminum, but because they perform specialized functions that many advanced technologies are built around.

As electric transport, renewable power, automation, digital infrastructure, and advanced manufacturing continue to expand, securing those materials will increasingly depend on more than discovering new deposits. The deeper challenge is building the technical capacity to separate, refine, manufacture, recover, and reuse them across a more diversified supply chain.