beryl


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beryl

(bĕr`ĭl), 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. Beryl is commonly used as a gemstone. The refractive index is low, and the stones have little or no fire. The most valued variety of beryl is emeraldemerald,
the green variety of beryl, of which aquamarine is the blue variety. Chemically, it is a beryllium-aluminum silicate whose color is due to small quantities of chromium compounds.
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. An aquamarineaquamarine
[Lat.,=seawater], transparent beryl with a blue or bluish-green color. Sources of the gems include Brazil, Siberia, the Union of Myanmar, Madagascar, and parts of the United States. Oriental aquamarine is a transparent crystalline corundum with a bluish tinge.
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 is a blue to sea-green beryl; morganites are rose-red beryls. It is the principal raw material for the element beryllium and its compounds.

Beryl

 

a mineral of the silicate class. Its chemical formula is Al2Be3(Si6O18), but because of the constant presence of alkalies (Na, Cs, Rb), Li, Mn, Fe2+, Fe3+, and Cr3+, and also water and gases (helium and argon), the composition of beryl is much more complicated. Various types of beryl—alkali-free, sodium, sodium-lithium, and lithium-cesium—are distinguished according to the alkali and lithium content. Beryl crystallizes in a hexagonal system, forming prismatic, acicular, or tabular crystals or complete granular masses. Beryl’s hardness on the mineralogical scale is 7.5, and its density is 2,650–2,800 kg/m3. The color of beryl is extremely varied. Depending upon the color, transparency, and impurities, the following types of beryl are distinguished: beryl proper—a green or yellowish-white cloudy crystal; aquamarine—transparent greenish-blue (the color of seawater) or dark blue crystals, colored with Fe2+ impurities; heliodor—yellow because of Fe2+ impurities; emerald—a transparent crystal of a deep grass-green color, colored by Cr3+; rosterite—colorless or pink owing to 5 percent or more Li1+ and Cs1+ impurities; and morganite—pink owing to Mn3+ impurities. Beryl forms in granitic pegmatites, greisens, skarns, and pneumatolytic-hydrothermal deposits of the metasomatic type. Beryl is one of the major minerals in beryl ore, from which beryllium is smelted. Transparent beautifully colored or clear crystals are cut to make high-quality precious stones.

REFERENCE

Beus, A. A. Geokhimiia berilliia i geneticheskie tipy berillievykh mestorozhdenii. Moscow, 1960. G. P. Barsanov

beryl

a white, blue, yellow, green, or pink mineral, found in coarse granites and igneous rocks. It is a source of beryllium and used as a gemstone; the green variety is emerald, the blue is aquamarine. Composition: beryllium aluminium silicate. Formula: Be3Al2Si6O18. Crystal structure: hexagonal
References in periodicals archive ?
Asked in the 1980s why she continued to ride long distances every week and race against men and women half her age, Beryl replied "because I like cycling".
Beryl spent her day celebrating with family and friends at Allesley Hall Nursing Home where she has lived since February this year.
When she spoke to the Echo in 2012 Beryl told of how she would never forget to send any of her offspring a card with PS5 in for birthdays and at Christmas.
As Inova continues down its path of being on the forefront of technology, it will rely on Beryl services and solutions to support its efforts in increasing community engagement, patient loyalty, and revenue enhancement.
Training at Canterbury District Memorial Hospital from 1945-1949, Beryl went on to gain many other qualifications in nursing.
Beryl also thinks there has been a change in the way the staff are treated.
But when we went back to finalise the list it was felt that Beryl was out of context in that she isn't a real person.
Joanna went on to make the Oscar-nominated Famous Fred and high profile adverts both at home and in the US as well as another Beryl film, Body Beautiful.
Gillian described Beryl as "my own personal Florence Nightingale".
L'emeraude qui est une variete de beryl vert transparent, etait l'une des pierres precieuses les plus prisees dans l'Antiquite La plus vieille mine d'emeraude connue est situee dans la vallee de montagne de Wadi Sikait dans le desert oriental de l'Egypte, ou l'extraction a probablement debutee vers la fin de la periode ptolemaique durant le premier siecle A.
Beryl, who remained in California, entered into a four-year lease with Harvey (his nephew), who continued farming the land.