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Rare earth elements (ree) are becoming increasingly important in electronic devices used in the defense, alternative energy, and communications industries. Minable deposits of rees are. Discover what rare earth elements and metals are, their unique properties, and why they're essential for modern technology, clean energy, and advanced manufacturing.

The rare-earth elements (ree), also called rare-earth metals, or rare earths, are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals. Ree-bearing mineral deposits are relatively rich in either light rare earth elements (lrees) or heavy rare earth elements (hrees), with lrees generally more abundant.