Ooid

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

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Notion

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Science and technology

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What Wikipedia says

Ooids (, from Ancient Greek ᾠόν (ōión) 'egg stone') are small (commonly ≤2 mm in diameter), spheroidal, "coated" (layered) sedimentary grains, usually composed of calcium carbonate, but sometimes made up of iron- or phosphate-based minerals.

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

Image: Photograph taken by Mark A. Wilson (Department of Geology, The College of Wooster)., Public domain, via Wikimedia Commons.