Subvolcanic rock

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

A subvolcanic rock, also known as a hypabyssal rock, is an intrusive igneous rock that is emplaced at depths less than 2 km (1.2 mi) within the crust, and has intermediate grain size and often porphyritic texture between that of volcanic rocks, which are extrusive igneous rocks, and plutonic rocks, which form much deeper in the ground.

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

Image: Motilla, CC BY-SA 3.0, via Wikimedia Commons.