beryl

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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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