Emerald
![Emerald crystal from [[Muzo]], [[Colombia]]](https://upload.wikimedia.org/wikipedia/commons/d/df/B%C3%A9ryl_var._%C3%A9meraude_sur_gangue_%28Muzo_Mine_Boyaca_-_Colombie%29_2.jpg)
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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by Group, Emerald
Bingley : Emerald Publishing Limited, 2015
Bingley : Emerald Publishing Limited, 2015
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by Emerald, John
New York : Beadle and Adams, 1874
New York : Beadle and Adams, 1874
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Book
6
by Dechant, Emerald
[Hays, Kan.] : [News Publishing Co.], 1976
[Hays, Kan.] : [News Publishing Co.], 1976
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7
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8
by Group, Emerald
Bradford : Emerald Group Publishing Limited, 2005
Bradford : Emerald Group Publishing Limited, 2005
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9
by Emerald, John
New York : Beadle and Adams, 1876
New York : Beadle and Adams, 1876
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10
by Emerald, John
New York : Beadle and Adams, 1878
New York : Beadle and Adams, 1878
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Book
11
by Emerald, David
Chicago : Polaris Publishing, 2016
Chicago : Polaris Publishing, 2016
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12
by Group, Emerald
Bingley : Emerald Publishing Limited, 2015
Bingley : Emerald Publishing Limited, 2015
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Book
14
by Emerald, John
New York : Beadle and Adams, 1874
New York : Beadle and Adams, 1874
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Book
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by Archer, Emerald M.
London, N.Y. : Bloomsbury Academic, 2017
London, N.Y. : Bloomsbury Academic, 2017
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