Cave pearl

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A cave pearl is a small, usually spherical, speleothem (cave formation) found in limestone caves. Cave pearls are formed by a concretion of calcium salts that form concentric layers around a nucleus.

Excerpt from the Wikipedia article “Cave pearl”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Original uploader was WTucker at en.wikipedia, CC BY-SA 3.0, via Wikimedia Commons.