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 ?
En 22 de Diciembre del dicho ano 1453, envio al senor Rey la condesa dona Juana un vaso de beril, con su pie de plata dorado e bebedero de plata asi mesmo dorado e con su sobre copa del mismo beril, guarnida de plata dorada, la qual dicha sobre copa tiene encima un leoncico pequeno con vela de plata dorada.
Beril Dedeoglu, "Degisen Dunyada Degisen Turkiye", Stratejik Dusunce Enstitusu, 10 Ekim 2009.
The author would like to thank Tony Silva, Crissy McMartin-Miller, Beril Tezel-Arik, and the anonymous reviewers for their valuable comments and suggestions which helped to considerably improve the quality of this paper.
The US Al-Monitor website in an article by Beril Dedeoglu wrote that like previous military exercises, Iran successfully tested new missiles and defense systems in its recent wargames in the Persian Gulf.
Ayenur Bahadir, Erol Erduran, Beril Dilber, Nalan Uctincti
Beril Dogu, Sisli Etfal Egitim ve Arastirma Hastanesi, Fizik Tedavi ve Rehabilitasyon Klinigi, Istanbul, Turkiye Tel.: +90 212 232 46 27-1424 Gsm: +90 532 622 52 84 E-posta: berildogu@hotmail.com
The following artists participated from Greece Maro Kerasioti, Iosifina Kosma; from the US, Bob Pool, Brad Evan Taylor; from Romania, Arina Alincia; from South Korea, Shin Jeung Son, Park Soon Kwan; from Hungary, Mariann Ban; from Turkey, Bingul Bagarir, Beril Anilanmert, Tuzum Kizilcan, Mustafa Tuncalp, Turker Ozdogan, Aygegul Turedi Ozen, Zehra Cobanli, Sevim Cizer, Ferhan Taylan Erder, Olcay Boratav, Odul Igitman, Alp Cam, Lerzan Ozer, Irfan Aydin, Bilgehan Uzuner, Nurdan Arslan, Oya Uzuner, Veysel Ozel, Hasan Sahbaz and Aydin Afacan.
Shalgi 25(2) PD 149, 153-54, 160, 161-62 (1971); CA 448/79 Bronstein v Bronstein 34(4) PD 714 (1980); CA 369/84 Michael Beril v.
Dedeoglu, Beril, "Turkiye'nin Turk Dunyasi ile Iliski Kurmasi Rusya'ya Ragmen Olamaz", Mulakatlarla Turk Dis Polikasi (Cilt I), Habibe Ozdal, Osman Bahadir Dincer, Mehmet Yegin (Ed.), (Ankara: USAK Yayinlari, 2009).
Beril Gulus Demirel, Ericiyes Universitesi Tip Fakultesi, Dermatoloji Anabilim Dali, Kayseri, Turkiye Tel: +90 352 437 76 15 e-posta: berilgy@yahoo.com