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Emerald is a gemstone, and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the 10-point Mohs scale of mineral hardness. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.
This app will add a few search access points on your device. If you do not want to use this new search page, you can either ignore it or delete it. If you do use it, we get a few cents and it will help us a lot to keep developing more apps. If you don’t, you can delete it and no harm is done (our app remains the same, no need to uninstall it!). Thank you.