Emerald

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https://term.museum-digital.de/md-de/tag/28627
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Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium or sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds have lots of material trapped inside during the gem´s formation, so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate.
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