Otherwise it looks much like the other rare earths.

Like other rare earths, this element is never found as a free element in nature but is found bound in monazite sand ores.

Also, the method of separating the rare earth elements by the method of ion exchange had not been invented yet in Moseley's time.

Rare earth elements change through time in small quantities (ppm, parts per million), so their proportion can be used for geochronology and dating fossils.

These rocks have low concentrations of large ion lithophile elements (LILE), light rare earth elements (LREE), volatile elements and other highly incompatible elements.

They could not yet produce pure samples of all the rare earth elements, even in the form of their salts, and in some cases they were unable to distinguish between mixtures of two very similar (adjacent) rare earth elements from the nearby pure metals in the Periodic Table.

This latter question about the possibility of more undiscovered ( missing ) elements had been a standing problem among the chemists of the world, particularly given the existence of the large family of the lanthanide series of rare earth elements.

There are two series of rare earth metals, the lanthanides and the actinides.

Rare earth mines are found throughout the world.

Ion exchange was for many years the only practical way to separate the rare earths in large quantities.

Even before the trawler incident, China was trying to regulate rare earths, defining them as a strategic resource.

The names of some terrestrial locations or astronomical objects are used to name the chemical elements.

Other countries might worry about the health risk to workers in rare earth processing, but that does not appear to be true of China.

China dominates the global market simply because it has fairly abundant rare earth ores close to the surface.

Most rare elements on Earth are not needed by life (exceptions being selenium and iodine), while a few common ones (aluminum and titanium) are not used.

The rare earth threat is not confined to Japan, as China accounts for over 90 of the world s production, roughly 120,000 tons.

Indeed, rare earth elements are rare only in the sense that they are distributed in small quantities and must be extracted from ores, a time consuming process.

Many countries are now planning to develop their own or alternative sources of rare earth elements, and to accelerate efforts to develop technologies that are free of them.

And India s government has shown its political savvy by forging an agreement to provide Japan with rare earth minerals a vital component in many manufacturing processes after China chose to use its supplies of rare earths as a diplomatic stick.

From employing its strong trade position to exploiting its near monopoly on the global production of vital resources like rare earth minerals, China has staked out a more domineering role in Asia.

So, in 2000 we wrote Rare Earth. In 2003, we then asked, let's not think about where Earths are in space, but how long has Earth been Earth?

Rare earth ores in southern China all except for those in Inner Mongolia contain radioactive substances that pose significant threats to human health and the environment.

After loss of volatile gases, as well as carbon and sulfur via reaction with hydrogen, this silicate mixture of elements formed most of the Earth's crust.

In the face of aggressive price cutting by Chinese rare earth producers, many mines in the US and elsewhere in the world were shut down over the years.

These are not rare occurrences.

From Rare Book Room.

The de facto export ban on rare earth elements often referred to as industrial vitamins struck a terrible blow to Japanese companies, which rely on China for 97 of their supply.

The Global Economy s Tale Risks

How did you come by these rare books?

Let us make use of this rare window of opportunity.

And deep beneath those oceans, at cracks in the Earth's crust, you've got heat seeping up from inside the Earth, and you've got a great diversity of elements.

But China has another motive for tightening the noose on rare earth exports it wants to force high tech firms to operate in China, so that local companies can absorb their technologies.

A senior official of a Chinese company has said that, even though rare earth exports have been restricted, Japanese companies can secure their supply by launching operations in China.

They also published some very rare photos of him.

Occurrence Iridium is one of the nine least abundant stable elements in Earth's crust, having an average mass fraction of 0.001 ppm in crustal rock gold is 40 times more abundant, platinum is 10 times more abundant, and silver and mercury are 80 times more abundant.

China s move, however, put the rest of the world on alert. Many countries are now planning to develop their own or alternative sources of rare earth elements, and to accelerate efforts to develop technologies that are free of them.

Many rare diseases appear early in life, and about 30 percent of children with rare diseases will die before reaching their fifth birthday.

This is a rare report of the Zhabdrung remaining.

The European Organization for Rare Diseases (EURORDIS) estimates that as many as 5,000 to 7,000 distinct rare diseases exist, and as much as 6 to 8 of the population of the European Union is affected by one.

The floor gave way.

We did not know that you possess this rare group of blood.

But this regulation, when combined with China s aggressive pricing, suggests a desire to assert monopoly control, and the de facto ban of rare earth exports to Japan looks like an effort to test the benefits of this looming monopoly.

We humans are very good at figuring out ways to make scarce things desirable.

When information is plentiful, the scarce resource is attention.

(iii) Solar terrestrial physics