| 翻訳と辞書 |
feldspar
}}
Feldspars (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8) are a group of rock-forming tectosilicate minerals that make up as much as 60% of the Earth's crust.〔Feldspar. (What is Feldspar? ) Industrial Minerals Association. Retrieved on July 18, 2007.〕
Feldspars crystallize from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock.〔"Metamorphic Rocks." (Metamorphic Rocks Information ). Retrieved on July 18, 2007〕 Rock formed almost entirely of calcic plagioclase feldspar (see below) is known as anorthosite.〔Blatt, Harvey and Tracy, Robert J. (1996) ''Petrology,'' Freeman, 2nd ed., pp. 206–210 ISBN 0-7167-2438-3〕 Feldspars are also found in many types of sedimentary rocks.〔"Weathering and Sedimentary Rocks." (Geology. ) Retrieved on July 18, 2007.〕
==Etymology==
The name ''feldspar'' derives from the German ''Feldspat'', a compound of the words ''Feld'', "field", and ''Spat'', "a rock that does not contain ore". The change from ''Spat'' to ''-spar'' was influenced by the English word "spar", a synonym for "mineral". "Feldspathic" refers to materials that contain feldspar. The alternate spelling, ''felspar'', has largely fallen out of use.
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「feldspar」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.
|
|