White and Gray: Granite that is predominantly made up of feldspar and quartz will generally be white or gray in color. The presence of small amounts of other minerals can give the rock a speckled appearance, with darker or lighter spots.
Pink and Red: The presence of potassium feldspar in granite can give it a pink or red color. The shade of pink or red can vary depending on the concentration of potassium feldspar.
Green: The presence of minerals such as chlorite or epidote in granite can give it a green color. These minerals are typically found in granite that has been exposed to high levels of heat and pressure.
Blue: The presence of minerals such as sodalite or lazurite can give granite a blue color. These minerals are typically found in granite that has been exposed to hydrothermal activity.
Black: The presence of minerals such as biotite or hornblende can give granite a black color. The concentration of these minerals can vary, resulting in different shades of black.