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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201
[Santa Barbara, CA : Journal of Services Marketing, Inc., 1987
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205
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[Bingley, United Kingdom] : Emerald Group Publishing Limited, 2014
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207
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208
Westport, CT : Meckler Corp., 1993
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209
Bradford, West Yorkshire, England ; Birmingham, Ala. : MCB Publications, 1980
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210
Ann Arbor, Mich. : Pierian Press, 1973
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211
Bradford, West Yorkshire, England : MCB Publications, 1980
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by Hunter, Lisa
Dordrecht ; New York : Springer, 2013
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“...Emerald, Elke...”Dordrecht ; New York : Springer, 2013
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214
by Hunter, Lisa
Dordrecht ; New York : Springer, 2013
Other Authors:
“...Emerald, Elke...”Dordrecht ; New York : Springer, 2013
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217
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218
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