Oncoïde

Rarity: Common

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What Wikipedia says

Un oncoïde (A. Heim, 1916; du grec onkos, nodule ou tumeur) est un nodule arrondi, le plus souvent calcaire, d’une taille allant du mm au cm, composé d’un noyau et de fines couches laminaires entourant concentriquement le noyau.

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

Image: Hannes Grobe/AWI, CC BY 4.0, via Wikimedia Commons.