Sunday, September 11, 2011

Gold, seize gold

In the history of our civilization had produced no more than 300 thousand tons of this metal. The search for gold are ever-increasing pace. Worldwide each year produces about one thousand five hundred tons of the precious metal. But nature is very carefully keeps his treasures. Gold is both rare and ubiquitous metal. Widely scattered it in various fields of nature in sea water four thousandths of a milligram of gold per cubic meter of water. And in all the oceans it contains about six million tons. Gold can be found in any fragment of granite. This beautiful metal has exceptional ability to pulverize, to give the smallest particles that are commensurate with the wavelength of light. Gold reserves, these particles at all, to what it touches. This is the only metal on the planet, which in its pure form has a nice bright yellow. When polished luster of gold even stronger. This is a very soft, malleable, ductile and malleable metal. From one gram of gold can be stretched into a wire of length three and a half kilometers, it can be raskovat so that it will transmit light. The thickness of the sheet should be no more than 0.0001 millimeter. Gold is considered the most precious metal of all metals, noble group. This metal does not oxidize in air even when heated. Gold does not change its properties in water, reacts with acids, alkalis and salts. Gold dissolves in aqua regia: a mixture of hydrochloric and nitric acid. Under the influence of chlorine at a temperature of 200 degrees Celsius converted into metallic gold and chlorine is highly soluble in water. Easily dissolved gold in mercury. Its concentration in the liquid metal may reach 15 percent, after which the solution solidifies. But gold is not just sprayed the whole earth, is the opposite: sometimes it is collected in large masses - nuggets. In 1869 in Australia found a lump of gold weighing 100 kilograms. Three years later, there was found an even larger nugget. He weighed 250 kilograms. None of the metal did not stir as much passion, not stirred up so much desire and willingness to take the most severe deprivation in the hope of "golden mountains" like gold.

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