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 periodicals archive ?
Egypt was probably the only source of emerald and other green beryl for the ancient civilizations of Europe and the Mediterranean region.
Not only could the researchers distinguish between an emerald from Russia and one from Madagascar, they could pinpoint the specific mine in each country from which the emerald came.
In this case, however, the Board does not believe that the acquisition of Emerald as a savings association would result in a violation of law.
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5-carat emerald was mounted in the Holy Crown of France by Louis IX in the 13th century.
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Joseph Besecker, President of Emerald Asset Management said, "We created this unique award to recognize leaders who epitomize the qualities that are inherent in the most successful business leaders - qualities that reflect an entrepreneurial spirit and a commitment to excellence," adding, "The award's name - E-3 - reflects these criteria: the Emerald Entrepreneurial and Excellence Award.
We are thrilled Secretary Snow has chosen the Emerald Groundhog Day Investment Forum as an opportunity to discuss the President's economic policy with leading business and investment executives," said Emerald Founder and CEO, Joseph E.
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