Beryl

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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.

Source: Dictionary of Mining, Mineral, and Related Terms


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