emerald

Emerald is a gemstone, and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium.[2] Beryl has a hardness of 7.5–8 on the 10-point Mohs scale of mineral hardness.[2] Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.

For more information about emerald check the Wikipedia article here

ZME Science posts about emerald

2000 year old gold earring found

Mon, Nov 10, 2008

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The Israel Antiquities Authority said that archaeologists found a 2,000-year-old gold earring next to the walls of the ancient city, under what was a parking lot. This is not the first amazingly well preserved piece of jewelry found in Israel, but many jewish works of art are often found in other places (such as the [...]

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