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prices and demand for rare earth materials have risen dramatically over the past decade. china produces about % of the supply. deposits in australia and the united states are going back into operation, and exploration in many new areas is progressing. heavy and light rare earth elements: the rare earth
elements are often subdivided into "heavy rare earths" and "light rare earths." lanthanum, cerium, praseodymium, neodymium, promethium, and samarium are the "light rare earths." yttrium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium are the "heavy rare...
https://geology.com/articles/rare-earth-elements/
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