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Ber"yl (bĕr"ĭl), n. [F. béryl, OF. beril, L. beryllus, Gr. bh`ryllos, prob. fr. Skr. vai&dsdot_;&ū;rya. Cf. Brilliant.] (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.