Shatter cone

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What Wikipedia says

Shatter cones are rare geological features that are only known to form in the bedrock beneath meteorite impact craters or underground nuclear explosions. They are evidence that the rock has been subjected to a shock with pressures in the range of 2–30 GPa (290,000–4,350,000 psi).

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

Image: Burkhard Mücke, CC BY-SA 4.0, via Wikimedia Commons.