The mineral beryl (also Beryllium aluminium meta-silicate and Beryllium aluminum meta-silicate) is a silicate of beryllium and aluminium with the chemical formula Be3Al2(SiO3)6. It has a vitreous lustre and can be transparent or translucent. Pure beryl is colorless, but it is frequently tinted by impurities; possible colors are green, blue, yellow, red, and white.
Beryl has been considered a gemstone since prehistoric times. Green beryl is called emerald, red beryl is bixbite or red emerald or scarlet emerald, blue beryl is aquamarine, pink beryl is morganite, and a clear bright yellow beryl is called golden beryl or heliodor. Other shades such as yellow-green and honey yellow are common.