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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 trachyandesite ： ウィキペディア英語版 trachyandesite Trachyandesite is an extrusive igneous rock. It has little or no free quartz, but is dominated by alkali feldspar and sodic plagioclase along with one or more of the following mafic minerals: amphibole, biotite or pyroxene. Small amounts of nepheline may be present and apatite is a common accessory mineral. Trachyandesitic magma can produce explosive Plinian eruptions, such as happened at Tambora in 1815. ==External links== * (Photomicrograph of a thin section of trachyandesite from France, in crossed-polarised light ) 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「trachyandesite」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.