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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 Bird's eye maple (mineral property) ： ウィキペディア英語版 Bird's eye maple (mineral property) Bird's eye maple, or bird's eye extinction, is a specific type of extinction exhibited by minerals of the mica group〔(Smith College - Geology 222b - Petrology - Petrographic Data File - Biotite ) Retrieved 2015-07-02〕 under cross polarized light of the petrographic microscope. It gives the mineral a pebbly appearance as it passes into extinction. This is caused when the grinding tools used to create petrographic thin sections of precise thickness alter the alignment of the previously perfect basal cleavage planes which split micas up into its characteristic thin sheets. The resulting, slightly roughened surface alters the extinction angle of various parts of the crystal lattice, leading to this type of extinction. Since it is not a natural feature of the mineral, bird's eye maple is not observed in all mica crystals, nor from all angles, but it is quite common, and is used as a diagnostic feature for micas. Common micas which exhibit this include biotite (and the magnesium end-member phlogopite) and muscovite. ==References== 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「Bird's eye maple (mineral property)」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.