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
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Beryl, a former fund raiser for Birmingham Dogs Home, runs the Harborne-based charity A1 Petline.
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Beryl mining ceased in Egypt with Spain's discovery of superior-quality Colombian emeralds in the 16th century AD.
Beryl is a beryllium alumino-silicate mineral with the chemical formula [Be.
His smaragdus included the Egyptian beryl among other green stones, but he also recognized its relationship with beryllus: "many people consider the nature of berulli to be similar to, if not identical with, that of smaragdi" (Pliny's Natural History 37.
The poor quality of Egyptian green beryl has been attested to repeatedly in both the ancient and modern literature (for a partial summary see Sinkankas, 1981, p.
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Born Beryl Hogg in Toxteth, she always loved singing but it was when at 15 she was on a night out at one of the many ballroom venues in the city with schoolfriends Irene and Linda that she got her first break.
Give her a go' and pushed me on stage," Beryl laughs.
In 1966, Beryl joined Rod Stewart, Peter Green and Mick Fleetwood to form Shotgun Express, while she also sang on John Lennon's Instant Karma and later discovered Buddhism, becoming close friends with Sandie Shaw.
Beryl Wolk, a Wharton School graduate, is a leader in the Cable TV Industry and co-founder of the Cable Advertising Bureau; he also co-founded the fifth largest magazine in the States: The Cable Guide, recently merged with TV Guide.