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The rare-earth elements (REE), also called the rare-earth metals or rare earths, and sometimes the lanthanides or lanthanoids (although scandium and yttrium, which do not belong to this series, are usually included as rare earths), [1] are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals. Compounds containing rare ...
Rare-earth ore, shown with a United States penny for size comparison. A rare-earth mineral contains one or more rare-earth elements as major metal constituents. Rare-earth minerals are usually found in association with alkaline to peralkaline igneous complexes in pegmatites. This would be associated with alkaline magmas or with carbonatite ...
The term rare-earth element or rare-earth metal is often used to include the stable group 3 elements Sc, Y, and Lu in addition to the 4f elements. [8] All lanthanide elements form trivalent cations, Ln 3+ , whose chemistry is largely determined by the ionic radius , which decreases steadily from lanthanum (La) to lutetium (Lu).
Pages in category "Rare earth alloys" The following 8 pages are in this category, out of 8 total. This list may not reflect recent changes. D. Didymium; H.
Rare earth scientists (122 P) Pages in category "Rare earth elements" The following 3 pages are in this category, out of 3 total.
Where the coal is from determines how straightforward rare earth extraction would be, the study found. Coal ash from the Appalachian Basin contains the highest amounts of rare earth elements, but ...
Second, the lighter rare earth elements are more incompatible (because they have larger ionic radii) and therefore more strongly concentrated in the continental crust than the heavier rare earth elements. In most rare earth ore deposits, the first four rare earth elements – lanthanum, cerium, praseodymium, and neodymium – constitute 80% to ...
The best rare earth stocks are in the spotlight as the demand for strategic and rare earth metals has been on the rise. The increase comes in part on the back of rising consumer interest in green ...