Radiolarite

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What Wikipedia says

Radiolarite is a siliceous, comparatively hard, fine-grained, chert-like, and homogeneous sedimentary rock that is composed predominantly of the microscopic remains of radiolarians. This term is also used for indurated radiolarian oozes and sometimes as a synonym of radiolarian earth.

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

Image: Pelex, CC BY 3.0, via Wikimedia Commons.