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The word "granite" comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a holocrystalline rock.
Strictly speaking, granite is an igneous rock with between 20% and 60% quartz by volume, and at least 35% of the total feldspar consisting of alkali feldspar, although commonly the term "granite" is used to refer to a wider range of coarse grained igneous rocks containing quartz and feldspar.
Granitoid is a general, descriptive field term for lighter-colored, coarse-grained igneous rocks.
Granites can be predominantly white, pink, or gray in color, depending on their mineralogy.
However, the composition and origin of the magma that differentiates into granite leaves certain geochemical and mineral evidence as to what the granite's parental rock was.
The final mineralogy, texture and chemical composition of a granite is often distinctive as to its origin.
For instance, a granite that is formed from melted sediments may have more alkali feldspar, whereas a granite derived from melted basalt may be richer in plagioclase feldspar.
It is on this basis that the modern "alphabet" classification schemes are based.Granitoids have crystallized from magmas that have compositions at or near a eutectic point (or a temperature minimum on a cotectic curve).