Marble

Marble is extremely stone, and its use is not only the marvelous works of art in Italy and Greece, which we admire in museums.

Marble is extremely stone, and its use is not only the marvelous works of art in Italy and Greece, which we admire in museums

Marble is composed of calcite (CaCO3) with impurities of other minerals, as well as organic compounds. Impurities differently affect its quality by reducing or increasing the decorative effect. Marble painting also depends on the impurities. Most colored marbles motley or banded (cipollino marble) color. Hardness is 2,5-3 on the Mohs scale, density is 2,3-2,6 g/cm3.

Now you can find marble in very many places. In the operating room, the marble in the form of plates indispensable for power plant - on the walls of the huge marble boards, non-conductive of electricity. In addition, it is used as stone monuments, as a piece building stone for exterior cladding and interior finishing of buildings and in the form of crushed and ground stone and a piece (saw) stone.

Marble is solid mineral, but soft enough for cutting iron. Pure white, dazzling white, sometimes - lovely variegated colors - yellow, pink, red, black; uniform and clean, not electrically conductive, resistant against the destructive action of water and air, marble - a wonderful material in the hands of a man who appreciated it even for many thousands of years before our time. Figure determined not only by the structure of the stone, but also the direction in which sawing is performed. Color and pattern of marble appear after polishing.

Among all the countries that produce and deliver marble high place belongs to Italy. Here, on the Mediterranean coast, in the famous Carrara, located to thousands of breakings of white marble. About 600 000 tonnes annually loaded into railway wagons and transported to the Mediterranean Sea and is loaded on ships. So each year send a huge amount of marble.

But marble is not eternal. It turns out the air, especially in the mountains, contains a lot of toxic substances for him, and so the rainwater destroys marbles unusually hard and fast. In a century dissolves about one millimeter of stone, and a thousand years - a centimeter. Also, proximity to the sea destroys much marble as salty sea spray for many hundreds of kilometers are being carried out within the country and even more eating away the stone. Snow acts even more rain, since absorbs from the air more toxic acids. Fine roots of plants and fungi also accelerate the destruction, and the wind carrying dust and sand.

Tools