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EMERALD "A"

EMERALD
EMERALD "A" TUMBLED STONE: Emerald is a gemstone, and a variety of the mineral beryl (Be3Al2(SiO3)6) coloredgreen by trace amounts of chromium and sometimes vanadium.[2] Beryl has ahardness of 7.58 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.
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