Granite

GRANITE — (ital. granito - verbatim - grainy) rock, mostly spread in continental Earth crust, normally consisting of quartz, potash feldspar (orthoclase, microcline), acid plagioclase and mica (biotite, muscovite). It is formed in the result of slow cooling down and freezing of magmatic melt at a great depth. Granite can also be formed at metamorphism, in the result … of granitization of different rocks. Some separate granite massifs are often assigned either magmatic, or metamorphic, or mixed nature. Average density is 600 kg/m3, compression strength is up to 300 MPa.

Color of granite is mainly pale grey, and quite often can be pink, red, yellow and even green (amazon-stone) granites. Structure is usually evenly-grained, most of grains have an irregular shape as a result of restricted growth with a massive crystallization. There are porphyry-shaped granites with large crystals of feldspars, quartz and mica, which can be distinguished on fine- or medium-grained main texture.

Granite has been used by humans for a long time as a building stone because of homogeneous structure, nice color, great strength and easy ways of mining and treatment.

In Russia there are … more than 50 deposits of granite, that can be used as piece stone, as well as rubble and crushed stone, — in Karelian Isthmus, close to Lakes Onega and Ladoga, in the Arkhangelsk and Voronezh Regions, in the Urals (in the Sverdlovsk and Chelyabinsk Regions), in the Primorye and Khabarovsk Regions, in the East Trans-Baikal Region, etc. Rapakivi granites of North-West of Russia and amazon-stone granites of Transbaikalia and the Ilmen mountings in the the Urals are especially decorative.

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