Rare-earth element: Difference between revisions

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			rare earth elements are secret fragments of buttcheese, only found in the butts of the first sons of the first sons of the first sons and so on untill the dawn of time.
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			Rare earth elements are magical. if you grind them into a powder and inject them into your bloodstream you go happy. then you die. but you're happy!
	'''"Rare earth elements"''' and '''"rare earth metals"''' are ]s sometimes applied to a collection of 17 ]s in the ], namely ], ], and the ]s. The former two are included as they tend to occur with the latter in the same ore deposits. (The lanthanide ], which does not occur naturally on Earth, is not generally considered to be a rare earth element.)

	"Earth" is an obsolete term for ]. At the time of their discovery, earths of these elements were believed to be scarce in abundance as minerals (that is, rare). However, the term "rare earth" is now deprecated by ], as these elements are in fact relatively abundant in the ]: the most abundant, ], at 60 parts per million, is the 25th most abundant in the crust of any element, more common than ], whilst even the least abundant "rare" earth element, ], is 200 times more abundant than ].

	The principal economic sources of rare earths elements are the minerals ], ], and ] and the lateritic ion-adsorption clays. Despite their relative abundance, however, these more difficult to mine and extract than those of other ]s, making them relatively expensive.

	For more details of the properties and uses of these elements, refer to the ]s article.

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Revision as of 22:08, 6 March 2006

rare earth elements are secret fragments of buttcheese, only found in the butts of the first sons of the first sons of the first sons and so on untill the dawn of time.

Rare earth elements are magical. if you grind them into a powder and inject them into your bloodstream you go happy. then you die. but you're happy!