Definition: Earth metals typically refer to the rare earth elements (REEs), which are a set of 17 chemical elements in the periodic table.

Elements: The 17 rare earth elements include the 15 lanthanides plus scandium and yttrium.

Lanthanides: The lanthanides are: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.

Scandium and Yttrium: Scandium and yttrium are considered rare earth elements because they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties.

Abundance: Despite their name, rare earth elements are relatively abundant in the Earth’s crust, but they are rarely found in concentrated and economically exploitable forms.

Key Producers: Major producers of rare earth elements include China, Australia, the United States, and Russia.

Chinese Dominance: China dominates the global production of rare earth elements, accounting for over 60% of the world’s supply.

Types of Deposits: Rare earth elements are typically found in three main types of deposits: carbonatites, ion-adsorption clays, and monazite sands.

Carbonatites: These are rare igneous rocks rich in carbonate minerals and are a significant source of rare earth elements.

Ion-adsorption Clays: Found mainly in southern China, these clays are a source of heavy rare earth elements.

Monazite Sands: Monazite is a phosphate mineral containing rare earth elements, often found in placer deposits.

Bastnäsite: This is another major source of rare earth elements, primarily found in the Mountain Pass mine in California, USA.

Uses in Technology: Rare earth elements are critical in the production of high-tech devices such as smartphones, electric vehicles, and wind turbines.

Magnets: Neodymium, dysprosium, and terbium are essential for making powerful permanent magnets used in various electronic devices.

Catalysts: Lanthanum and cerium are used in catalytic converters for automotive exhaust systems to reduce emissions.

Phosphors: Europium and terbium are used in phosphors for color television screens, LED lights, and fluorescent lamps.

Nuclear Industry: Some rare earth elements, like gadolinium, are used in nuclear reactors due to their ability to absorb neutrons.

Aerospace: Yttrium is used in the production of superalloys for jet engines and other high-temperature applications.

Medical Applications: Certain rare earth elements are used in medical imaging, such as gadolinium in MRI contrast agents.

Environmental Impact: The extraction and processing of rare earth elements can have significant environmental impacts, including soil and water contamination.