… Chondrites are classified into five chemical groups, E, H, L, LL, and C chondrites (carbonaceous chondrites), based on their chemical composition and the composition of their constituent minerals. Most of the iron in E chondrites exists as metallic iron or iron sulfide, with very little iron oxide. Therefore, the FeO/(MgO + FeO) molar ratio of pyroxene, which occurs as the main silicate mineral in E chondrites, is always less than 0.1. … *Some of the terminology that refers to "E chondrites" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… コンドライトはその化学組成や構成鉱物の組成により,E,H,L,LLおよびCコンドライト(炭素質コンドライト)の五つの化学的グループに区分される。Eコンドライト中の鉄成分は,そのほとんどが金属鉄や硫化鉄として存在し,酸化鉄はきわめて少ない。そのために,Eコンドライト中のおもなケイ酸塩鉱物として産する輝石のFeO/(MgO+FeO)モル比は常に0.1以下である。… ※「E コンドライト」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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