An element belonging to the alkaline earth metals. Symbol, Be. Beryl and
bertrandite are the most important commercial sources of the element and
its compounds. Aquamarine and emerald are the precious forms of beryl.
Used in nonsparking tools, high-speed aircraft, missiles, spacecraft,
communications satellites, and X-ray lithography for microminiature
integrated circuits, as well as in nuclear reactors and computers.
Beryllium and its salts are toxic.
Dictionary of Mining, Mineral, and Related Terms