Granite is a coarse-grained igneous rock composed mainly of quartz, feldspar and mica. And just where do you find quartz, feldspar and mica? At the center of the earth, of course. It's there where granite crystallizes under extreme pressure. So much pressure, in fact, that it's nearly as hard as a diamond. Like a diamond, granite is prized for its beauty. Its variety of striking colors and distinctive structural characteristics make any home unique.