Mineral composed of beryllium aluminum silicate, BeAl(SiO), a commercial source of beryllium. Several varieties are valued as gemstones: aquamarine (pale blue-green); emerald (deep green); heliodor (golden yellow); and morganite (pink). Before 1925 beryl was used only as a gemstone, but since then many important uses have been found for beryllium (e.g., in nuclear reactors, space vehicles, and X-ray tubes). No large deposits have been found, and most production is a by-product of the mining of feldspar and mica. Brazil is a major producer; others include Zimbabwe, South Africa, Namibia, and the U.S.
This entry comes from Encyclopædia Britannica Concise.
For the full entry on beryl, visit Britannica.com.
Seen & Heard
What made you look up beryl? Please tell us what you were reading, watching or discussing that led you here.