Coccolith

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What Wikipedia says

Coccoliths are individual plates or scales of calcium carbonate formed by coccolithophores (single-celled phytoplankton such as Emiliania huxleyi) and cover the cell surface arranged in the form of a spherical shell, called a coccosphere.

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

Image: Photo by NEON ja, colored by Richard Bartz, CC BY-SA 2.5, via Wikimedia Commons.