A transparent pale green, blue, or yellow mineral consisting of a silicate of beryllium and aluminum, sometimes used as a gemstone.
- ‘Emerald, a green transparent variety of beryl, was one of the most highly prized gemstones in antiquity.’
- ‘Lepidolite, beryl, tantalite, quartz crystals, and altered and unaltered petalite are some of the minerals that can be found in this district.’
- ‘Egypt was probably the only source of emerald and other green beryl for the ancient civilizations of Europe and the Mediterranean region.’
- ‘Since 1900 the site has sporadically produced gem tourmaline as well as rhodizite and beryl.’
- ‘Beryllium is found as the mineral beryl, a beryllium aluminum silicate.’
Middle English: from Old French beril, via Latin from Greek bērullos.