Beryl

n.

1.

(Min.) A mineral of great hardness, and, when transparent, of much beauty. It occurs in hexagonal prisms, commonly of a green or bluish green color, but also yellow, pink, and white. It is a silicate of aluminum and beryllium. The aquamarine is a transparent, sea-green variety used as a gem. The emerald is another variety highly prized in jewelry, and distinguished by its deep color, which is probably due to the presence of a little oxide of chromium.

Noun

1.

beryl - the chief source of beryllium; colored transparent varieties are valued as gems

aquamarine, atomic number 4, Be, beryllium, emerald, glucinium, mineral, morganite