Granite is a standard and widely occurring type of intrusive, felsic, igneous rock. Granite has a medium to coarse texture, occasionally with some individual crystals bigger than the groundmass forming a rock known as porphyry. Granites may be pink to dark grey and even black, depending on their chemistry and mineralogy. Outcrops of granite are likely to form tors, and rounded massifs. Granites typically happen 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 should intrude other rocks. Most granite intrusions are emplaced at depth within the crust, often larger than 1.5 kilometers and up to 50 km depth within thick continental crust. The origin of granite is contentious and has led to different 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 different means. Generally, the ‘alphabet-soup’ classification is used because it classifies based on genesis or origin of the magma.
Historical Uses of Granites
Granite is nearly always large (lacking inner buildings), hard and tough, and therefore it has gained widespread use as a development 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 Great 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 once had a cultured granite pyramidion or capstone, now on display in the main hall of the Egyptian Museum in Cairo.
Many large Hindu temples in southern India have been made of granite. There’s a considerable amount of granite in these structures. They’re 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 quantities of acid rain in parts of the world, granite has begun to supplant marble as a monument materials, since it is way more durable. Polished granite can be a popular alternative for kitchen countertops due to 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 mixture content has an look similar to 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 perfect stones can price as much as US$1,500.
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