418
10 facts about the emeralds
Emerald - one of the most beautiful and fascinating gems. We offer you a selection of facts about the emeralds.
1. Emerald - a particularly valuable variety of beryl.
2. The largest stones can weigh up to 5 carats and more expensive diamonds. These stones have a thick rich color.
3. The Roman emperor Nero used an emerald as a monocle through which watched gladiatorial fights. Unfortunately, after the death of the stone disappeared.
4. Emeralds stand out among the other gems of its fragility. They can crack even from minor bumps.
5. The largest emerald in the world was found in 1974 in Brazil. His weight was 28 kg.
6. The largest emerald crystal treated weighs 7, 5 kg. He was also found and treated in Brazil, where there are more than 6000 of the emerald mines.
7. The most prized transparent stones with a rich green color. In addition to the price greatly influences the amount of microcracks and other mineral impurities. However, common stones found in nature very rarely.
8. There are so-called "explosive" emeralds that may eventually break up into several parts due to internal stresses in the crystal.
9. Cut emeralds that promotes intensification of colors, was set up in order to avoid chipping over the stone.
10. Emeralds are used not only in jewelry, but also to create a solid-state lasers.
via factroom.ru
10 of the most recent studies of the human brain
The tsunami of 2011 in Japan created a huge sand dunes on the ocean floor