Granites can be predominantly white, pink, yellow and black or gray, depending on their mineralogy. The word "granite" comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a holocrystalline rock.
is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs.
is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone.
Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.
Pure quartzite is usually white to grey color, other colors, such as yellow, green, blue and orange, are due to other minerals.