Granite is a typical 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 will be pink to dark grey and even black, relying on their chemistry and mineralogy. Outcrops of granite tend 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 but it should intrude other rocks. Most granite intrusions are emplaced at depth within the crust, normally 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 different 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. Generally, the ‘alphabet-soup’ classification is used because it classifies based on genesis or origin of the magma.
Historical Uses of Granites
Granite is sort of always large (lacking inside buildings), hard and difficult, and due to this fact it has gained widespread use as a construction stone. The Red Pyramid of Egypt, named for the light crimson hue of its exposed granite surfaces, is the third largest of Egyptian pyramids. Maleskaure’s Pyramid, was constructed of limestone and granite blocks. The Nice Pyramid of Giza incorporates a huge granite sarcophagus fashioned of «Red Aswan Granite.» The largely ruined Black Pyramid dating from the reign of Amenemhat III once had a refined granite pyramidion or capstone, now on display in the primary corridor of the Egyptian Museum in Cairo.
Many giant Hindu temples in southern India have been made of granite. There is a considerable 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 rising amounts of acid rain in parts of the world, granite has begun to supplant marble as a monument materials, since it is much more durable. Polished granite can be a popular alternative for kitchen countertops because of its high durability and aesthetic qualities.
Engineers have traditionally used polished granite surfaces to determine a airplane of reference, since they’re comparatively impervious and inflexible. Sandblasted concrete with a heavy mixture content material has an look 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 much as US$1,500.
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