Granite is a standard and widely occurring type of intrusive, felsic, igneous rock. Granite has a medium to coarse texture, often with some individual crystals larger than the groundmass forming a rock known as porphyry. Granites might be pink to dark grey or even black, depending on their chemistry and mineralogy. Outcrops of granite are likely to form tors, and rounded massifs. Granites generally occur in circular depressions surrounded by a range of hills, formed by the metamorphic aureole or hornfels.
Granite is an igneous rock and is formed from magma. Granitic magma has many potential origins but it must intrude other rocks. Most granite intrusions are emplaced at depth within the crust, usually higher than 1.5 kilometers and as much as 50 km depth within thick continental crust. The origin of granite is contentious and has led to diverse schemes of classification. Classification schemes are regional; there is a French scheme, a British scheme and an American scheme. This confusion arises because the classification schemes define granite by totally different means. Usually, the ‘alphabet-soup’ classification is used because it classifies based on genesis or origin of the magma.
Historic Uses of Granites
Granite is sort of always large (lacking inside constructions), hard and difficult, and therefore it has gained widespread use as a building stone. The Red Pyramid of Egypt, named for the light crimson hue of its uncovered granite surfaces, is the third largest of Egyptian pyramids. Maleskaure’s Pyramid, was constructed of limestone and granite blocks. The Nice Pyramid of Giza comprises an enormous granite sarcophagus fashioned of «Red Aswan Granite.» The principally ruined Black Pyramid dating from the reign of Amenemhat III as soon as had a elegant granite pyramidion or capstone, now on display in the main hall of the Egyptian Museum in Cairo.
Many large Hindu temples in southern India had been made of granite. There may be a considerable amount of granite in these structures. They are comparable to the Great Pyramid of Giza
Granites Use in Present age
Granite has been extensively used as a dimension stone and as flooring tiles in public and commercial buildings and monuments. With growing amounts of acid rain in parts of the world, granite has begun to supplant marble as a monument material, since it is much more durable. Polished granite is also a popular alternative for kitchen countertops on account of its high durability and aesthetic qualities.
Engineers have traditionally used polished granite surfaces to ascertain a aircraft of reference, since they’re relatively impervious and inflexible. Sandblasted concrete with a heavy aggregate content has an look much like rough granite, and is usually used as a substitute when use of real granite is impractical. Because of the particular rarity of the granite, the very best stones can price as a lot as US$1,500.
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