15 facts about precious metals
• 15 facts about precious metals
1. Precious metals - metals are not subject to corrosion and oxidation, which distinguishes them from the majority of metals. All of them are also precious metals, due to their rarity. Basic precious metals - gold, silver and platinum and other platinum group metals is 5 - (ruthenium, rhodium, palladium, osmium, iridium). Some authors refer to as noble metals and technetium, which is not found in nature (besides it is radioactive with short half-life).
2. Gold - is such a rare metal that one hour in the world find more iron than found in the history of gold.
3. Platinum previously considered "improper silver" and thrown into a river or sea, in order not to get underfoot. Only later, when jewelers from Spain found that platinum is perfectly fused with gold, it was used as a raw material jewelry.
4. "Aqua regia" - that is a mixture of hydrochloric and nitric acids. This "cocktail" dissolves gold.
5. Interestingly, the native silver occurs much less frequently than native gold, but the total amount of gold in the world is much less than silver. Here's a paradox.
6. In 1828, the year produced platinum coins in Russia 3, 6 and 12 rubles. At that time, platinum was worth half the price of silver. 7. Gold - an excellent conductor, so it is the most important raw material in the electrical industry.
8. In Russian - "Silver" in English - "Silver" in German - "Silber" - all these words are derived from the ancient Indian word "Sarpa", which stands for the moon and crescent moon.
9. In ancient Egypt, gold was considered particles gods, therefore they were not allowed to own anyone other than Pharaoh.
10. The largest silver nugget was found in Chile and weighed 1420 kg.
11. Noble metals such as gold, platinum, silver and palladium are not chemically react with the body. That is why these metals are actively used in medicine and jewelry industry.
12. Olympic medal, handed in 1912, were made of pure gold. In the modern world of sports medals cover only 6 grams of this metal.
13. In 1933, Frank Roosevelt signed the decree, which prohibited US citizens keep in their gold. Violation of the decree was punishable by a fine of 10 thousand dollars, or ten years in prison.
14. Russia is a leader in the production and supply of palladium on the world market.
15. Gold 999th sample is so soft that it can easily be scratched with a fingernail.