You searched for: “rare earth minerals
rare-earth minerals, rare earth minerals; rare earth elements
1. A collective term for a series of fifteen related metallic elements having atomic numbers ranging from 57 to 71, and placed in a special row on the periodic table.

    The group consists of the following elements which are not earths and are not literally rare; however, they are called "rare earth minerals" because they were associated with more familiar substances known as "common earth".

    This Lanthanide series is shown with their atomic numbers, their symbols, and their names with links to much more detailed information about the history, who and where they were discovered, terms in four other languages, etc. for each of the listed elements as shown in the Periodic Table of Chemical Elements:

  • 57 La, Lanthanum
  • 58 Ce, Cerium
  • 59 Pr, Praseodymium
  • 60 Nd, Neodymium
  • 61 Pm, Promethium
  • 62 Sm, Samarium
  • 63 Eu, Europium
  • 64 Gd, Gadolinium
  • 65 Tb, Terbium
  • 66 Dy, Dysprosium
  • 67 Ho, Holmium
  • 68 Er, Erbium
  • 69 Tm, Thulium
  • 70 Yb, Ytterbium
  • 71 Lu, Lutetium
  • The elements range in crustal abundance (igneous crust or outer layer of the earth) from cerium, the 25th most abundant element of the 78 common elements in the earth's crust at 60 parts per million, to thulium and lutetium, the least abundant rare-earth elements at about 0.5 part per million.

2. Minerals which contain one or more rare-earth elements as major metal constituents.

Seventeen rare-earth minerals are used in a wide variety of commercial and military applications ranging from precision guided smart bombs, to efficient light bulbs, car batteries, sophisticated radar systems, mobile phones, clean energy technology, DVDs, very large wind turbines, phosphors for monitors, televisions, lighting, catalytic converters, glass polishing, petroleum refining; plus other modern applications.

Rare-earth minerals are also used in computer display screens, motherboards, hard drives, chips, and other-related elements in computers; rare metals like indium is used in liquid-crystal display screens, antimony is used in silicon wafers for semiconductors, neodymium is a vital element in industrial batteries which are used in electric motors and it is found in parts used in the speakers of cellphones, and dysprosium is used in laser materials.

Cerium is needed in such high-profile and sensitive applications as optical sensors used in F-15 fighter aircraft, and the windows and domes at the National Ignition Facility (NIF) which explores the world of high-energy-density physics.

Over 50 pounds of rare earth metal can be found in each Toyota Prius automobile and Japan is the world’s largest importer of rare earths for such products.

Hybrid vehicles use a special neodym magnet made with neodymium to help produce the energy they require to offset their usage of gas and oil.

On April 20, 2010, neodymium was priced at about $46.50 a kilogram (2.20 pounds). Since China made export rules and regulations in July, 2010, prices went up to $92 a kilogram (2.20 pounds).

Rare earth production outside of China by other countries has been limited by higher costs of mining (compared to those of China) and by concerns regarding environmental pollutions from mining wastes by other nations.

The United States previously produced all stages of the rare earth material supply chain, but now most rare earth materials processing is performed in China, giving it a dominant position that can affect the worldwide supply and prices of rare earth minerals.

According to the United States Geological Survey (USGS), the name “rare” earth elements is an “historical misnomer”, reflecting the elements’ unfamiliarity, rather than their true rarity.

Even the most scarce of rare earths, lutetium and thulium, are 200 times more abundant than gold in the earth’s crust.

China has about fifty-seven percent of the world’s known reserves, according to the United States Geological Survey. The United States has nine percent of global reserves, Australia has four percent, and Russia has fourteen percent.

Also, according to figures from the U.S. Geological Survey published earlier this year, production from Chinese mines accounted for 120,000 of the 124,000 tons of rare-earth oxides produced globally in 2009; which is more than 97 percent of the available supply; while India, Brazil, and Malaysia made up the rest of the supply or just three percent of the total.

Molycorp, the United States company that owns the Mountain Pass mine in the Mojave Desert of California, announced its intention to raise rare-earths production to meet about a sixth of global demand by 2012, and the company indicated that it would double that output if circumstances justify such an increase of production.

—Compiled from information located in various sources; especially:
The U.S. Geological Survey web site, and
The Chemical Elements List at this Word Info web site.
Additional valuable information is available at this
Rare Earth Elements and their Uses web site.
This entry is located in the following unit: rar-, rare- + (page 1)