Granite is a common igneous rock that consist of primarily four minerals. These minerals include Quartz (at least 20%), Feldspar, Hornblende, and Mica. Quartz comes in yellow, milky white, rose, brown to black, blue, and purple amethyst. Feldspar can be glassy white, blue, green pink, or red crystals. Hornblende is black, brown and green. Finally, Mica may be clear, black, green, red, yellow, brown, and more. The components of the rock differs depending on the location, which also results in different colours and patterns. They are usually found in the continental plates of the earth's crust.