翻訳と辞書 Words near each other ・ Rhynie, Aberdeenshire ・ Rhynie, South Australia ・ Rhyniella praecursor ・ Rhyniognatha ・ Rhyniopsida ・ Rhyno Janse van Rensburg ・ Rhynochetos ・ Rhynocoris ・ Rhynocoris albopilosus ・ Rhynocoris albopunctatus ・ Rhynocoris iracundus ・ Rhynocoris rubricus ・ Rhynocoris tristis ・ Rhynwick Williams ・ Rhyodacite ・ Rhyolite ・ Rhyolite Head ・ Rhyolite Islands ・ Rhyolite, Nevada ・ Rhyon Nicole Brown ・ Rhyothemis ・ Rhyothemis braganza ・ Rhyothemis fenestrina ・ Rhyothemis graphiptera ・ Rhyothemis phyllis ・ Rhyothemis princeps ・ Rhyothemis resplendens ・ Rhyothemis semihyalina ・ Rhyothemis triangularis ・ Rhyothemis variegata Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Rhyolite ： ウィキペディア英語版 Rhyolite Rhyolite is an igneous, volcanic rock, of felsic (silica-rich) composition (typically > 69% SiO2—see the TAS classification). It may have any texture from glassy to aphanitic to porphyritic. The mineral assemblage is usually quartz, sanidine and plagioclase (in a ratio > 2:1—see the QAPF diagram). Biotite and hornblende are common accessory minerals. It is the extrusive equivalent to granite. ==Geology== Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock, and consequently, outcrops of rhyolite may bear a resemblance to granite. Due to their high content of silica and low iron and magnesium contents, rhyolite melts are highly polymerized and form highly viscous lavas. They also occur as breccias or in volcanic plugs and dikes. Rhyolites that cool too quickly to grow crystals form a natural glass or vitrophyre, also called obsidian. Slower cooling forms microscopic crystals in the lava and results in textures such as flow foliations, spherulitic, nodular, and lithophysal structures. Some rhyolite is highly vesicular pumice. Many eruptions of rhyolite are highly explosive and the deposits may consist of fallout tephra/tuff or of ignimbrites. 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「Rhyolite」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.