intrusive rock

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Intrusive rock (Wikipedia) Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form intrusions, such as batholiths, dikes, sills, laccoliths, and volcanic necks.

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Igneous rocks can be either intrusive (plutonic and hypabyssal) or extrusive (volcanic).
An intrusion is any body of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet.
Intrusive rocks are characterized by large crystal sizes, and as the individual crystals are visible, the rock is called phaneritic.

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Wikipedia

Intrusive rock (Wikipedia) Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form intrusions, such as batholiths, dikes, sills, laccoliths, and volcanic necks.