Physical and mechanical properties of granite
Granite consists of four minerals: quartz, mica, hornblende and feldspar.This rock is formed in the bowels of the earth, and then slowly cooled and condensed.Because of the slow cooling, the crystals all four minerals can grow to sizes, easily distinguishable by the human eye.Thus, for example, it can be easily seen in the cluster structure of granite and shiny black mica quartz crystals.
Depending on the color and composition of deposits of granite may vary.Its color varies from pink-red to dark gray.Such a wide range of shades depending on the amount of impurities that are found in different parts of the globe.Granite has a remarkable hardness.Among natural stones in their hardness is second only to diamond (6 to 10
on the international scale of hardness).Granite is practically impossible to break without special equipment.
Disputes about the toxicity of granite were long.Scientists came to the conclusion that after all it is not toxic and in this sense is not able to harm the human body.By their nature, granite emits radiation.However, the radiation background, which creates this breed is negligible.Its value is much less than the natural background radiation that is provided by secondary cosmic rays.
granite as a building material
in granite as a building material was used in ancient times.Palaces, built of this stone back in ancient times, and today look almost new.Granite - a chemically inert material of low porosity and igneous origin.It does not react with acids, alkalis and absolutely immune to the vagaries of weather.Granite does not require maintenance.It is often used to make kitchen countertops.
now demand polished granite slabs.They were treated with the help of a diamond crumb - only the hardest stone can cope with granite.These plates look very beautiful and they are almost impossible to bend.Special care they require.
Granite has only one drawback - the high price, which is related to its unique properties (hardness, chemical inertness), and the difficulty of extraction and processing.It lies deep in the earth, and the extraction process consumes a lot of electricity.