The platinum

In the middle of the 17th century in Colombia Spanish, washing gold, found with it a dark heavy silvery metal - the platinum. The platinum seemed as heavy as gold, and it can not be separated from the gold washing. The name was given by the Spanish conquistadors in the mid-16th century. They met for the first time in South America with a new metal that looks like silver. The word literally means "little silver". The dismissive title is exceptional refractoriness of platinum, so it a long time no use and was valued twice lower than silver.

In the middle of the 17th century in Colombia Spanish, washing gold, found with it a dark heavy silvery metal - the platinum

Although platinum and resembled silver (in Spanish - la plata), but it was almost insoluble and stubbornly resisted the smelting; considered harmful impurity accidental or deliberate forgery precious gold. Therefore, the Spanish government at the beginning of the 18th century ordered the harmful metals back into the river. For the first time in a pure form the platinum was obtained from the ores by the British chemist William Wollaston in 1803.

In 1819, platinum was discovered in the Urals. Its remarkable properties have attracted the attention not only of chemists. The idea melt of it to coins - three-, six- and twelve-rubleviki. The platinum has become the precious metal. At this time 95% of the total world production it was mined in the Urals. About 6 tons of platinum annually went from Ural placers.

Mainly platinum went to dentistry - crowns, fillings, teeth. Other platinum went to jewelery. Finally, the third was on the electrical equipment and chemical glassware, very valuable in its persistence of fire.

Besides Urals the platinum was discovered in South Africa. Deposits of platinum stretched from the Cape of Good Hope to Northern Rhodesia, in the space of one and a half thousand kilometers. The platinum content in the earth's crust is 5*10-7% by weight. Even the so-called native platinum is an alloy containing from 75 to 92% platinum, 20% iron, and iridium, palladium, rhodium, osmium, less copper and nickel.

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