Here's why:

* Phaneritic means the rock has large, visible crystals. This is because the slow cooling process allows for ample time for mineral crystals to grow and reach a significant size.

Examples of phaneritic igneous rocks:

* Granite: A light-colored, coarse-grained rock rich in quartz and feldspar.

* Diorite: A medium-grained rock with a composition between granite and gabbro.

* Gabbro: A dark-colored, coarse-grained rock rich in pyroxene and plagioclase feldspar.

In contrast, fast cooling magma results in aphanitic textures, where crystals are too small to be seen with the naked eye.