BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Uncut emeralds. Uncut emeralds (green) in rock. Emerald is a variety of the mineral beryl. It is composed of beryllium aluminium silicates. Emerald occurs mostly in veins of clay and limestones. It is a precious gem when cut and polished, with fine examples commanding high prices.
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