Rare-earth element

Rarity: Rare

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Notion

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Science and technology

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What Wikipedia says

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. The 15 lanthanides (or lanthanoids), along with scandium, and yttrium, are usually included as rare earths.

Excerpt from the Wikipedia article “Rare-earth element”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Peggy Greb, US department of agriculture, Public domain, via Wikimedia Commons.