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True granite (according to modern petrologic convention) contains both plagioclase and alkali feldspars.When a granitoid is devoid or nearly devoid of plagioclase, the rock is referred to as alkali feldspar granite.) is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture.Granites can be predominantly white, pink, or gray in color, depending on their mineralogy.These are rare, because it is difficult to turn basalt into granite via fractional crystallisation.A-type or anorogenic granites are formed above volcanic "hot spot" activity and have a peculiar mineralogy and geochemistry.
This process operates regardless of the origin of the parental magma to the granite, and regardless of its chemistry.
Granite is nearly always massive (lacking any internal structures), hard and tough, and therefore it has gained widespread use throughout human history as a construction stone.
The average density of granite is between 2.65 and 2.75 g/cm Granite is classified according to the QAPF diagram for coarse grained plutonic rocks and is named according to the percentage of quartz, alkali feldspar (orthoclase, sanidine, or microcline) and plagioclase feldspar on the A-Q-P half of the diagram.
Two-mica granites are typically high in potassium and low in plagioclase, and are usually S-type granites or A-type granites.
A worldwide average of the chemical composition of granite, by weight percent, based on 2485 analyses: Much of it was intruded during the Precambrian age; it is the most abundant basement rock that underlies the relatively thin sedimentary veneer of the continents.