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Granites

Granite is a common type of intrusive, felsic, igneous rock which is granular and phaneritic in texture. This rock consists mainly of quartz, mica, and feldspar. Occasionally some individual crystals (phenocrysts) are larger than the groundmass, in which case the texture is known as porphyritic. A granite rock with a porphyritic texture is sometimes known as a porphyry. Granites can be pink to gray to black in color, depending on their chemistry and mineralogy. By definition, granite is an igneous rock with at least 20% quartz by volume.


The word "Granite" comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a crystalline rock.