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 much 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 Emerald, John
New York : Beadle and Adams, 1874
New York : Beadle and Adams, 1874
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by Emerald, John
New York : Beadle and Adams, 1878
New York : Beadle and Adams, 1878
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by Emerald, John
New York : Beadle and Adams, 1876
New York : Beadle and Adams, 1876
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by Group, Emerald
Bingley : Emerald Publishing Limited, 2015
Bingley : Emerald Publishing Limited, 2015
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by Emerald, David
Chicago : Polaris Publishing, 2016
Chicago : Polaris Publishing, 2016
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9
by Group, Emerald
Bradford : Emerald Group Pub., 2004
Bradford : Emerald Group Pub., 2004
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10
by Group, Emerald
Bradford : Emerald Group Pub., 2005
Bradford : Emerald Group Pub., 2005
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11
by Emerald, John
New York : Beadle and Adams, 1874
New York : Beadle and Adams, 1874
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12
by Dechant, Emerald
[Hays, Kan.] : [News Publishing Co.], 1976
[Hays, Kan.] : [News Publishing Co.], 1976
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13
by Group, Emerald
Bingley : Emerald Publishing Limited, 2015
Bingley : Emerald Publishing Limited, 2015
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by Emerald Group
Bradford : Emerald Group Publishing, 2003
Bradford : Emerald Group Publishing, 2003
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15
by Group, Emerald
Bradford : Emerald Group Pub., 2005
Bradford : Emerald Group Pub., 2005
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by Group, Emerald
Bradford : Emerald Group Pub., 2004
Bradford : Emerald Group Pub., 2004
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by Group, Emerald
Bradford : Emerald Group Publishing Limited, 2005
Bradford : Emerald Group Publishing Limited, 2005
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