What type of igneous rock contains large mineral crystals Explain why.?

Igneous rocks that contain large mineral crystals are typically classified as intrusive or plutonic rocks. These rocks form from magma that cools slowly beneath the Earth's surface, allowing sufficient time for large crystals to grow. Examples include granite and diorite, which exhibit a coarse-grained texture due to this slow cooling process. In contrast, extrusive or volcanic rocks cool rapidly at the surface and usually have smaller crystals.