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・ Emerald Tablet
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・ Emer Kenny
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Emerald
・ Emerald (Alan Stivell album)
・ Emerald (CDP), Wisconsin
・ Emerald (Dar Williams album)
・ Emerald (disambiguation)
・ Emerald (mango)
・ Emerald (programming language)
・ Emerald Academy
・ Emerald Air
・ Emerald Air (1995)
・ Emerald Air (United States)
・ Emerald Airport
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・ Emerald aphyosemion
・ Emerald ash borer


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Emerald : ウィキペディア英語版
Emerald

Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium.〔Hurlbut, Cornelius S. Jr. and Kammerling, Robert C. (1991) ''Gemology'', John Wiley & Sons, New York, p. 203, ISBN 0-471-52667-3.〕 Beryl has a hardness of 7.5–8 on the Mohs scale.〔 Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor. It is a cyclosilicate.
==Etymology==
The word "Emerald" is derived (via Old French: Esmeraude and Middle English: Emeraude), from Vulgar Latin: Esmaralda/Esmaraldus, a variant of Latin Smaragdus, which originated in Greek: σμάραγδος (smaragdos; "green gem").

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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