Based on the appearance of Pegmatite, identify which type of rock it would be.

Pegmatite is a type of rock that is characterized by its large crystals. It forms during the final stage of a magma's crystallization. The large crystals are a result of the high water content in the magma, which allows minerals to grow larger than in other types of rock.

Step 1: Observe the rock's physical characteristics. Pegmatite is often light-colored and coarse-grained, with individual mineral grains usually larger than 2.5 cm in size.

Step 2: Identify the minerals present. Pegmatite is composed of quartz, feldspar, and mica, and may also contain minerals that are rarely found in other types of rocks.

Step 3: Consider the rock's formation process. Pegmatite forms from magma that is rich in water and other volatile substances. As the magma cools, these volatiles form pockets of highly pressurized steam that help to drive the growth of large mineral crystals.

Based on these characteristics, pegmatite is classified as an intrusive igneous rock. This means it formed from magma that cooled and solidified beneath the Earth's surface. The slow cooling process allowed for the growth of the large crystals that are characteristic of pegmatite.