GRANITE MEMORIAL

详情

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 granitic rock with a porphyritic texture is sometimes known as a porphyry. Granites can be pink to gray in color, depending on their chemistry and mineralogy. By definition, granite is an igneous rock with at least *0% quartz by volume. Granite differs from granodiorite in that at least *5% of the feldspar in granite is alkali feldspar as opposed to plagioclase;is the alkali feldspar that gives many granites a distinctive pink Granites sometimes occur in circular depressions surrounded by a range of hills, formed by the metamorphic aureole or hornfels. Granite is usually found in thecontinental plates of the Earth's crust.