…The following names are given according to the composition range: Ab 100 An 0 to Ab 90 An 10 = albite, Ab 90 An 10 to Ab 70 An 30 = oligoclase, Ab 70 An 30 to Ab 50 An 50 = andesine, Ab 50 An 50 to Ab 30 An 70 = labradorite, Ab 30 An 70 to Ab 10 An 90 = bytownite, Ab 10 An 90 to Ab 0 An 100 = anorthite. Plagioclase is widely found in igneous rocks, metamorphic rocks, and sedimentary rocks. … *Some of the terminology explanations that mention "oligoclase" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…組成範囲によって次のような名が与えられている。Ab100An0~Ab90An10=アルバイトalbite(曹長石),Ab90An10~Ab70An30=オリゴクレースoligoclase(灰曹長石),Ab70An30~Ab50An50=アンデシンandesine(中性長石),Ab50An50~Ab30An70=ラブラドライトlabradorite(曹灰長石),Ab30An70~Ab10An90=バイトウナイトbytownite(亜灰長石),Ab10An90~Ab0An100=アノーサイトanorthite(灰長石)。斜長石は,火成岩をはじめ変成岩,堆積岩に広く産する。… ※「オリゴクレース」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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