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.

Read more about Emerald:  Etymology, Properties Determining Value, Emerald Localities, Synthetic Emerald, Emerald in Different Cultures, and Emerald Lore, Notable Emeralds, Gallery

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Emerald, Texas
... Emerald (also called Emerald Grove and Laverne) is a ghost town in Crockett County, Texas, United States ... County was organized in 1890 and Ozona became the county seat, the entire town of Emerald moved to Ozona ... In 1897 the last remaining building in Emerald, the school house, was moved to Ozona ...
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Short-tailed Emerald
... The Short-tailed Emerald (Chlorostilbon poortmani) is a species of hummingbird found in the Andes of Colombia and Venezuela ... It has also been called Poortman's Emerald Hummingbird ...
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... ononaria Rest Harrow — south-east (Red Data Book) ‡ Pseudoterpna coronillaria Jersey Emerald — Jersey Pseudoterpna pruinata atropunctaria Grass Emerald — throughout Geometra papilionaria Large ...
AFL Central Queensland Highlands - Defunct Competitions - Central Highlands AFL - Premiers
... ? 1985 Moranbah 1986 Moranbah 1987 Middlemount 1988 Emerald 1989 Emerald 1990 Blackwater 1991 Blackwater 1992 Blackwater 1993 Emerald 1994 Emerald 1995 Emerald 1996 Emerald 1997 Emerald ...

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)