Granite is chock full of color variations, giving the stone its signature speckled, mottled texture. Granite is mainly comprised of quartz, feldspar, and mica, but also often contains other minerals in lesser amounts. Feldspar and hematite are responsible for any white, pink and red spots while hornblende can cause darker green and black variations. Quartz often creates shades of gray, while muscovite, biotite, lepidolite will create specks of silver, black, and violet, respectively.