emerald

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emerald,

the green variety of berylberyl
, mineral, a silicate of beryllium and aluminum, Be3Al2Si6O18, extremely hard, occurring in hexagonal crystals that may be of enormous size and are usually white, yellow, green, blue, or colorless.
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, of which aquamarine is the blue variety. Chemically, it is a beryllium-aluminum silicate whose color is due to small quantities of chromium compounds. The emerald was highly esteemed in antiquity; the stones were used for ornaments in early Egypt where some of the first emeralds were mined. The finest emeralds are found in South America in Colombia, where they have been mined for over 400 years. The gem was a favorite in pre-Columbian Mexico and Peru, where it was cut in intricate designs. The treasure taken back to Spain by early explorers included emeralds. Good emeralds are the most highly valued of gem stones. Zambia and Brazil are also significant sources of the natural stones. Synthetic emeralds are also manufactured in Germany, France, and the United States. The Oriental emerald, a different gem, is the transparent green variety of corundumcorundum
, mineral, aluminum oxide, Al2O3. The clear varieties are used as gems and the opaque as abrasive materials. Corundum occurs in crystals of the hexagonal system and in masses. It is transparent to opaque and has a vitreous to adamantine luster.
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Emerald

 

a mineral that is a transparent variety of beryl tinged with an admixture of Crj03 to a deep grass-green color. Emeralds are found in crystals and their concretions, usually intergrown in micaceous rock, quartz, or feldspar. The crystals, measuring 2–5 cm by 0.5–2 cm, rarely larger, are fractured. The larger deposits are connected with zones of the contact alteration of amphibolites, magnesial schist, and serpentinites by granitic pegmatites. Emeralds are also found in quartz feldspar veins and in altered schistose-carbonate rocks. Deposits are rare and are mainly in the USSR (Urals), Republic of South Africa (Transvaal), and Colombia (Muzo). Emeralds are highly valued as gems; those that are large (more than 5 carats), flawless, and have a deep, rich color are considered to be more valuable than diamonds.

Synthetic emeralds (so-called igmeralds) are made, but their crystals are often fissured and no larger than 0.5 by 3 cm.

emerald

[′em·rəld]
(mineralogy)
Al2(Be3Si6O18) A brilliant-green to grass-green gem variety of beryl that crystallizes in the hexagonal system; green color is caused by varying amounts of chromium. Also known as smaragd.

emerald

May. [Am. Gem Symbolism: Kunz, 319–320]

emerald

relieves diseases of the eye. [Gem Symbolism: Kunz, 370]
See: Healing

emerald

1. a green transparent variety of beryl: highly valued as a gem
2. 
a. the clear green colour of an emerald
b. (as adjective): an emerald carpet

Emerald

An object-oriented distributed programming language and environment developed at the University of Washington in the early 1980s. Emeral was the successor to EPL. It is strongly typed and uses signatures and prototypes rather than inheritance.

["Distribution and Abstract Types in Emerald", A. Black et al, IEEE Trans Soft Eng SE-13(1):65-76 (Jan 1987)].
References in classic literature ?
Guillemard was still in her place, but she really was the only lady, and dressed as quietly as I had prophesied; round her neck was her rope of pearls, but not the glimmer of an emerald nor the glint of a diamond, nor yet the flashing constellation of a tiara in her hair.
The green maiden was much astonished at the sight of so unusual a creature, for horses were unknown in this Land; but those who lived in the Emerald City were apt to be astonished by queer sights, so after inspecting the cab-horse and noting the mild look in his big eyes the girl decided not to be afraid of him.
The little man was clothed in black velvet, with many sparkling emerald ornaments decorating his breast; but his bald head and wrinkled features made him appear more amusing than impressive.
Ozma had been quite curious to meet the famous man who had built the Emerald City and united the Munchkins, Gillikins, Quadlings and Winkies into one people; so when they were all four seated at the dinner table the Princess said:
And Dorothy looked wonderingly at this lively appearing person, who had once assembled an army of women and driven the Scarecrow from the throne of the Emerald City, and even fought a battle with the powerful army of Glinda the Sorceress.
And now they came in sight of the Emerald City, and the people flocked out to greet their lovely ruler.
The wealthiest and most important citizens of the Emerald City were proud to wait upon these famous adventurers, and they were assisted by a sprightly little maid named Jellia Jamb, whom the Scarecrow pinched upon her rosy cheeks and seemed to know very well.
right up to the Emerald City--and you will march your armies there and capture the whole country
My Nomes are good fighters, but they are not strong enough to conquer the Emerald City.
But in the Emerald City everything is green that is purple here.
Yes; he was one of those who helped Dorothy to destroy the Wicked Witch of the West, and the Winkies were so grateful that they invited him to become their ruler, -- just as the people of the Emerald City invited the Scarecrow to rule them.
The shaggy man introduced Johnny Dooit to Dorothy and Toto and Button-Bright and the Rainbow's Daughter, and told him the story of their adventures, adding that they were anxious now to reach the Emerald City in the Land of Oz, where Dorothy had friends who would take care of them and send them safe home again.