intrusive rock

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

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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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extrusive rock

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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.