Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite has a medium to coarse texture, often 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 inclined to form tors, and rounded massifs. Granites sometimes 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 however it must intrude different rocks. Most granite intrusions are emplaced at depth within the crust, usually greater than 1.5 kilometers and up to 50 km depth within thick continental crust. The origin of granite is contentious and has led to varied schemes of classification. Classification schemes are regional; there’s a French scheme, a British scheme and an American scheme. This confusion arises because the classification schemes define granite by different means. Typically, the ‘alphabet-soup’ classification is used because it classifies primarily based on genesis or origin of the magma.
Historical Makes use of of Granites
Granite is almost always huge (lacking inner constructions), hard and hard, 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. Menkaure’s Pyramid, was constructed of limestone and granite blocks. The Great Pyramid of Giza accommodates a huge granite sarcophagus fashioned of «Red Aswan Granite.» The mostly ruined Black Pyramid dating from the reign of Amenemhat III once had a sophisticated granite pyramidion or capstone, now on display in the main corridor of the Egyptian Museum in Cairo.
Many large Hindu temples in southern India have been made of granite. There may be a considerable amount of granite in these structures. They are comparable to the Nice 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 way more durable. Polished granite can also be a popular choice 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 are comparatively impervious and inflexible. Sandblasted concrete with a heavy aggregate content material has an appearance much like rough granite, and is commonly used as a substitute when use of real granite is impractical. Because of the particular rarity of the granite, one of the best stones can cost as a lot as US$1,500.
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