Granite is a typical and widely occurring type of intrusive, felsic, igneous rock. Granite has a medium to coarse texture, occasionally with some individual crystals larger 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 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 should intrude other 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 assorted 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 completely different means. Typically, the ‘alphabet-soup’ classification is used because it classifies based mostly on genesis or origin of the magma.
Ancient Uses of Granites
Granite is sort of always huge (lacking inner structures), hard and tough, and subsequently 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 comprises a huge granite sarcophagus fashioned of «Red Aswan Granite.» The mostly 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 principle corridor of the Egyptian Museum in Cairo.
Many giant Hindu temples in southern India were made of granite. There is a large amount of granite in these structures. They are comparable to the Great Pyramid of Giza
Granites Use in Current 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 can be a preferred selection for kitchen countertops on account of its high durability and aesthetic qualities.
Engineers have traditionally used polished granite surfaces to determine a airplane of reference, since they’re relatively impervious and inflexible. Sandblasted concrete with a heavy combination content material has an appearance similar to rough granite, and is commonly used as a substitute when use of real granite is impractical. Because of the particular rarity of the granite, the very best stones can value as much as US$1,500.
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