Here's why:

* Intrusive: Granite forms when magma cools and solidifies slowly beneath the Earth's surface. This slow cooling allows for the formation of large crystals.

* Large Crystals: The slow cooling process gives the minerals in the magma ample time to grow into large, visible crystals. These crystals are often several millimeters or even centimeters in size.

Other examples of intrusive igneous rocks with large crystals include:

* Diorite: A dark-colored igneous rock with large crystals of plagioclase feldspar and hornblende.

* Gabbro: A dark-colored igneous rock with large crystals of plagioclase feldspar and pyroxene.

Key takeaway: Intrusive igneous rocks generally have larger crystals than extrusive igneous rocks, which cool quickly at the surface.