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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 IVB meteorite ： ウィキペディア英語版 IVB meteorite IVB meteorites are a group of ataxite iron meteorites classified as achondrites. The IVB group has the most extreme chemical compositions of all iron meteorites, meaning that examples of the group are depleted in volatile elements and enriched in refractory elements compared to other iron meteorites. ==Description== The IVB meteorites are composed of meteoric iron (kamacite, taenite and tetrataenite). The chemical composition is low in volatile elements and high in nickel and refractory elements. Although most IVB meteorites are ataxites ("without structure"), they do show microscopic Widmanstätten patterns. The lamellae are smaller than 20µm wide and lie in a matrix of plessite. The Tlacotepec meteorite is an octahedrite, making a notable exception, as most IVBs are ataxites.〔(【引用サイトリンク】url=http://www.nhm.ac.uk/research-curation/research/projects/metcat/search/detail.dsml?Key=T1230&passed_Name=Tlacotepec&index=&sort=Name&Grp=IVB&beginIndex=10&listPageURL=list%2edsml%3fsort%3dName%26Grp%3dIVB& )〕 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「IVB meteorite」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.