DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Aquamarine crystals in muscovite mineral. This is a variety of beryl (beryllium aluminium silicate). Emerald is the green variety, while aquamarine has a green-blue colour. The colour is caused by trace amounts of iron. The hexagonal crystals form the columns seen in the rock. Aquamarine is used as a gemstone.
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