beryl


Also found in: Dictionary, Thesaurus, Wikipedia.

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.
..... Click the link for more information.
. 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.
..... Click the link for more information.
 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 ?
Beryl put off surgery that would remove her womb and travelled abroad in a desperate attempt to find a cure.
Under the terms of the agreement, African Potash will enter into a long term relationship with Beryl Holdings, whereby Beryl's main fertiliser trading activities (which include trading, logistics and financing) will be restructured and operated via a newly formed Mauritian company, which will become a wholly owned subsidiary of African Potash.
The appropriately-named Samantha Power shines in the exhausting role of Beryl, in which she travelled around Review Production: Beryl by Maxine Peake Venue: Lawrence Batley Review: Chloe Glover .
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".
with Bethan " To thank the centre Beryl decided to take on the challenge at Zip World in Blaenau Ffestiniog.
He used the skills and equipment known by cobblers for generations," Beryl added.
Beryl spent her day celebrating with family and friends at Allesley Hall Nursing Home where she has lived since February this year.
She followed Beryl into racing and they often came up against each other.
Dame Beryl was born in Liverpool in 1933 and lived much of her life on Ravenmeols Lane, Formby.
But, when widow Beryl and divorced Bill reconnected in their 60s they began to go on dates.
Beryl, who was born in Dudley, had often reminisced about the black and white photograph, which was taken on her mother's 21st birthday - which is on the same day as Beryl's - at the zoo.