What type of rock will have discreet sections of minerals in coarse grains?

The type of rock that typically has discrete sections of minerals in coarse grains is called a "granite." Granite is an igneous rock composed mainly of quartz, feldspar, and mica, and its coarse-grained texture allows individual mineral crystals to be easily distinguished. The slow cooling of magma beneath the Earth's surface facilitates this coarse crystallization. Other examples of coarse-grained rocks include diorite and gabbro, which have similar textures but different mineral compositions.