Emerald

Emerald

Emerald is 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.

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Famous quotes containing the word emerald:

    “Well, Mr. Thornton, you are a wonder. It looks the way all Irish cottages should and so seldom do. And only an American would have thought of emerald green.”
    —Frank S. Nugent (1908–1965)