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Encyclopedia > Rare earth elements

de;Metalle der Seltenen Erden


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Rare earth element - Wikipedia, the free encyclopedia (189 words)
"Rare earth elements" and "rare earth metals" are trivial names sometimes applied to a collection of 17 chemical elements in the periodic table, namely scandium, yttrium, and the lanthanides.
At the time of their discovery, earths of these elements were believed to be scarce in abundance as minerals.
The principal economic sources of rare earths elements are the minerals bastnasite, monazite, and loparite and the lateritic ion-adsorption clays.
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