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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク 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）』 ■ウィキペディアで「emerald」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.