Some metals are hard to find.
They hide inside rocks. These metals help make phones. They also help make big wind fans. They are very useful to us. Do you use a phone?
There are 17 special metals.
They look like shiny silver. They are soft and heavy. They hide inside other rocks.
These metals are not truly rare. They are just hard to separate. It takes a lot of work to clean them. We use them in many things. They help make magnets and lasers. They also help make phones. These metals are very useful to us.
There are 17 special metals called rare-earth elements.
They are shiny and silver. They are also soft and heavy. Most of them belong to a group called lanthanides. Two other metals, scandium and yttrium, are also included.
The name "rare-earth" is a bit of a mistake. These metals are not actually hard to find. They are quite common in the Earth's crust. For example, cerium is more common than copper.
However, they are usually spread out in very small amounts. They are often found inside other minerals. This makes them hard to pull out and clean.
We use these metals for many important things. They help make magnets and lasers. They are also used in glass and electronics. We need them for smartphones and wind turbines.
They even help make parts for electric cars. Because they are so useful, many countries want to find and use them. China produces most of the world's supply. Other countries like the US and Australia also work to make them.
Rare-earth elements are a special group of 17 metals.
They look like shiny, silvery-white metal. These metals are soft and quite heavy. Most of them are part of a group called lanthanides. Two other metals, scandium and yttrium, are also included in this group. These metals are very important for our modern world. They are used to make lasers, magnets, and special glass. They are also found in many electronic parts.
Without them, we would not have many of our favorite gadgets.
The name "rare-earth" is actually a bit of a mistake. These metals are not truly rare or hard to find. In fact, they are quite common in the Earth's crust. Cerium is the 25th-most-abundant element. It is even more common than copper!
The problem is how they are found. They are usually spread out in very tiny amounts. They are often hidden inside other minerals. This makes it a very hard job to pull them out. It takes a lot of energy and money to clean them. This process is called isolation.
Learning about these metals took a long time. In 1787, a man named Carl Axel Arrhenius found a black mineral called gadolinite. He found it in a place called Ytterby in Sweden.
This single town gave its name to four different elements! In 1803, researchers found a white oxide they called ceria. Later, in 1839, Carl Gustav Mosander found a way to separate these metals. He used heat and acid to do this. It was a slow process of discovery that lasted for many years.
Scientists used new tools to find more elements. In 1879, a man named Delafontaine used a tool called optical flame spectroscopy. This tool looks at light to see what elements are there. This helped scientists find new spectral lines. Later, Henry Gwyn Jeffreys Moseley used X-rays to study them. He proved there were exactly 15 lanthanides. He even found that one element was missing. That missing element was promethium. It was finally made in 1945.
This was the last rare-earth element to be discovered.
Today, these metals are in high demand. We use them for smartphones and wind turbines. They are also used in electric vehicles.
China produces most of the world's supply. In 2019, China supplied about 90% of the world's rare-earth powders. Other countries like the United States and Australia also produce them. Brazil has the second-largest reserves of these metals. As we move toward new energy, we will need even more of these special metals.
The rare-earth elements, or REEs, are a group of 17 nearly identical metals. They are characterized by a lustrous, silvery-white appearance and a soft, heavy texture. This group includes 15 lanthanides, which are a series of chemical elements. Scientists also include scandium and yttrium in this category because they share similar chemical behaviors.
While they are vital for modern technology, the name "rare-earth" is actually a misnomer. These metals are not truly scarce in the Earth's crust. For example, cerium is the 25th-most-abundant element at 68 parts per million. This makes it more common than copper. However, they are rarely found as pure metals in nature. Instead, they exist in compounds and are spread thinly as trace impurities. This makes them very difficult to isolate and purify.
Extracting these elements is a complex and energy-intensive process. Because they are often dispersed, economically useful ore deposits are quite sparse. REEs are frequently found in minerals alongside radioactive elements like thorium and uranium. This co-occurrence means that mining can lead to environmental pollution and human rights concerns. In modern commercial production, these metals are often traded as "rare-earth oxides" (REOs). These are mixtures of various elements in oxide compounds.
Recent scientific breakthroughs have attempted to make this easier. In 2022, researchers studied a flash heating method. They mixed fly ash with carbon black and sent a one-second current pulse through it. This extreme heat shatters the microscopic glass that encapsulates the metals. This process can extract twice as much material using much less acid than conventional methods.
Historically, the discovery of these elements was a slow and confusing journey. The first rare-earth mineral, gadolinite, was discovered in 1787. Lieutenant Carl Axel Arrhenius found it at a quarry in Ytterby, Sweden.
This single village is famous because four different elements are named after it. In 1803, researchers Jöns Jacob Berzelius and Wilhelm Hisinger obtained a white oxide they called ceria. Separation was extremely difficult because the metals have such similar chemical properties. It took many years for scientists to realize that substances like ceria and yttria were actually mixtures. In 1839, Carl Gustav Mosander used heat and nitric acid to separate lanthana. His work eventually led to the identification of terbium and erbium.
As technology advanced, scientists used light to identify new elements. In 1879, Delafontaine used optical flame spectroscopy to find new spectral lines. Spectroscopy is a process that uses light to identify the unique signatures of elements. This helped researchers isolate samarium and gadolinium. Later, Henry Gwyn Jeffreys Moseley used X-ray crystallography to study atomic numbers. His work confirmed that there were exactly 15 lanthanides. He even predicted a missing element, number 61. This element was promethium, which was finally produced synthetically in 1945.
Promethium is unique because it does not occur naturally in the crust except in tiny trace amounts.
Today, the demand for REEs is growing rapidly due to global technological shifts. They are essential components in lasers, magnetic materials, and glass. They are also critical for the transition to renewable energy. Electric vehicles and wind turbines rely heavily on these metals. Consumer electronics, such as smartphones, and defense applications also require them.
Because of this, many nations view them as critical minerals. These are materials of strategic or economic importance to a country's stability.
Global production and reserves are highly concentrated in specific regions. China currently dominates the market. In 2019, China supplied approximately 90% of the global demand for rare-earth powders. This dominance has led to trade tensions and supply restrictions. For instance, China has placed restrictions on sales since around 2010. Following a trade war in 2025, further restrictions led other nations to increase their own production. The United States and Australia are the second and third-largest producers. However, Brazil holds the second-largest reserves of these metals in the world.
Understanding rare-earth elements requires looking at the intersection of chemistry, geology, and economics. Their geochemical properties cause them to be dispersed, making them hard to find in high concentrations. This connects to broader discussions about environmental enrichment and human health. Scientists are still exploring the long-term effects of REE pollution on the environment. As the world moves toward advanced electronics and green energy, the study of these 17 metals will only become more important.
They remain a fundamental part of the modern industrial landscape.
Where will your curiosity go next?
🖼️ Images & Media (5)
More to explore
What is Nepedia?
A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.