Polycystine

Rarity: Common

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What Wikipedia says

The polycystines are a group of radiolarians. They include the vast majority of the fossil radiolaria, as their skeletons are abundant in marine sediments, making them one of the most common groups of microfossils. These skeletons are composed of opaline silica.

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

Image: User Magnus Manske on en.wikipedia, Public domain, via Wikimedia Commons.