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beryl

From: The Columbia Encyclopedia, Sixth Edition | Date: 2008

beryl , mineral, a silicate of beryllium and aluminum, Be ₃ Al ₂ Si ₆ O ₁₈ , 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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