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beryl |
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berylMineral that forms crystals chiefly in granite. It is the chief ore of beryllium. Two of its gem forms are aquamarine (light-blue crystals) and emerald (dark-green crystals).
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| Gem varieties of beryl include emerald (green), aquamarine (blue), red beryl, goshenite (colourless), heliodor (yellow), and morganite (pink or peach). Ordinary beryl is colourless but the presence of various trace impurities gives the gemstone varieties of this mineral their distinctive colours: green emerald, blue to bluish-green aquamarine, pink morganite, red bixbite, and yellow to yellowish-orange heliodor (Sinkankas, 1981, p. |
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