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A hexagonal mineral, Be3 Al2 Si6 O18 ; green,
blue-green, and other pale tints; in granite pegmatites, mica schists, and
an accessory mineral in felsic igneous rocks; the chief source of
beryllium. Transparent and colored gem varieties include emerald,
aquamarine, morganite, heliodor, golden beryl, bixbite, and vorobievite.
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