beryl

{{Infobox mineral | boxbgcolor = #91d1d1 | name = Beryl | category = Cyclosilicate | image = Beryl09.jpg | imagesize = 260px | alt = | caption = Three varieties of beryl (left to right): morganite, aquamarine and emerald | formula = | IMAsymbol=Brl | molweight = 537.50 g/mol | strunz = 9.CJ.05 | system = Hexagonal | class = Dihexagonal dipyramidal (6/mmm)H-M symbol: (6/m 2/m 2/m) | symmetry = P6/mcc | unit cell = a = 9.21 Å, c = 9.19 Å; Z = 2 | color = Green, blue, yellow, colorless, pink, and others | habit = Prismatic to tabular crystals; radial, columnar; granular to compact massive | twinning = Rare | cleavage = Imperfect on {0001} | fracture = Conchoidal to irregular | tenacity = Brittle | mohs = 7.5–8.0 | luster = Vitreous to resinous | polish = | opticalprop = Uniaxial (−) | refractive = nω = 1.564–1.595 nε = 1.568–1.602 | birefringence = δ = 0.0040–0.0070 | dispersion = | pleochroism = Weak to distinct | fluorescence= None (some fracture-filling materials used to improve emerald's clarity do fluoresce, but the stone itself does not). Morganite has weak violet fluorescence. | absorption = | streak = White | gravity = 2.63–2.92 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent to translucent | other = | references = }}

Beryl ( ) is a mineral composed of beryllium aluminium silicate with the chemical formula Be3Al2(SiO3)6. Well-known varieties of beryl include emerald and aquamarine. Naturally occurring hexagonal crystals of beryl can be up to several meters in size, but terminated crystals are relatively rare. Pure beryl is colorless, but it is frequently tinted by impurities; possible colors are green, blue, yellow, pink, and red (the rarest). It is an ore source of beryllium. thumb|upright=1.5|Main beryl producing countries