Granite

GRANITE STONE

Granite is typical of a more prominent family of granitic rocks, or granitoid, that are composed chiefly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase (the QAPF classification), with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few (leucogranites) have almost no dark minerals.