Pseudotachylyte

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What Wikipedia says

Pseudotachylyte (sometimes written as pseudotachylite) is an extremely fine-grained to glassy, dark, cohesive rock occurring as veins that form through frictional melting and subsequent quenching during earthquakes, large-scale landslides, and impacts events.

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

Image: Abri le Roux (Abri_Beluga on Flickr) https://www.flickr.com/people/beluga/, CC BY 2.0, via Wikimedia Commons.