beryl

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beryl Accessory mineral, Be3Al2Si6O18; sp. gr. 2.6–2.8; hardness 7.5–8.0; hexagonal; normally green, sometimes blue, yellow, or pink, and translucent to transparent; vitreous lustre; crystals hexagonal prisms, often striated, also occurs massive; cleavage perfect basal hardness; occurs extensively in cavities in granites, pegmatites, mica schists and gneisses, and associated with rutile. It is an ore mineral for beryllium. Transparent green varieties are emeralds, bluish-green are aquamarine, and pink are morganite.

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beryl (bĕr´Ĭl), mineral, a silicate of beryllium and aluminum, Be3Al2Si6O18, extremely hard, occurring in hexagonal crystals that may be of enormous size and are usually white, yellow, green, blue, or colorless. Beryl is commonly used as a gemstone. The refractive index is low, and the stones have little or no fire. The most valued variety of beryl is emerald. An aquamarine is a blue to sea-green beryl; morganites are rose-red beryls. It is the principal raw material for the element beryllium and its compounds.

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beryl Mineral, beryllium silicate. Its crystals are usually hexagonal prisms of the hexagonal system. Gemstone varieties are aquamarine (pale blue-green) from Brazil; emerald (deep green) from Colombia; and morganite (pink) from Madagascar. Cut stones have little brilliance, but are valued for their intense colour. Hardness 8; r.d. 2.6–2.8.

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Beryl

Group of precious stones that includes emerald and aqua-marine. Colorless beryl is known as goshenite; rose beryl is called verobyerite or morganite; golden beryl is called heliodor; and there are also pale blue stones (aquamarine) and blue-green stones. Beryl was traditionally recommended for curing throat or liver disorders. It was also said to preserve wedded love and to be a good medium for magical vision.

(See also Crystal Gazing )

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ber·yl / ˈberəl/ • n. a transparent pale green, blue, or yellow mineral consisting of a silicate of beryllium and aluminum, sometimes used as a gemstone.

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beryl a transparent pale green, blue, or yellow mineral consisting of a silicate of beryllium and aluminium, sometimes used as a gemstone, which in early sources is taken as a type of perfect clarity.

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beryl precious stone. XIII. — (O)F. beril (mod. béryl) — L. bēryllus — Gr. bḗrullos.