…Different names are given depending on the ratio of Mg to Fe. Commonly used names include enstatite (Mg 100 to Mg 90 Fe 10 ), bronzite (also called bronze pyroxene, Mg 90 Fe 10 to Mg 70 Fe 30 ), and hypersthene (also called schismatic pyroxene, Mg 70 Fe 30 to Mg 50 Fe 50 ). Here, Mg 50 Fe 50 means that the atomic ratio is 50% Mg and 50% Fe. … From [Orthopyroxene]...Also contains small amounts of Ca, Al, Ti, Mn, Fe 3+ , etc. When the Fe 2+ /(Mg+Fe 2+ ) ratio is 0-0.1, it is called enstatite, when it is 0.1-0.3, it is called bronzite (also called bronze pyroxene), when it is 0.3-0.5, it is called hypersthene (also called ferrohypersthene), when it is 0.5-0.7, it is called ferrohypersthene (also called iron pyroxene), when it is 0.7-0.9, it is called eulite, when it is 0.9-1.0, it is called ferrosilite (also called iron pyroxene), but recently when it is 0.1-0.9, it is sometimes called hypersine. In the past, the boundary between bronzite and hypersine in meteorites was set at 0.8, but this classification is not used these days because it is easy to make mistakes. ... *Some of the terminology that mentions "bronzite" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…MgとFeの比によってそれぞれ異なる名称が与えられている。よく用いられるものとしては,エンスタタイト(Mg100~Mg90Fe10),ブロンザイトbronzite(古銅輝石ともいい,Mg90Fe10~Mg70Fe30),ハイパーシンhypersthene(シソ輝石ともいい,Mg70Fe30~Mg50Fe50)などである。ここでMg50Fe50とは,原子比でMg50%,Fe50%よりなることを表す。… 【斜方輝石】より…ほかに少量のCa,Al,Ti,Mn,Fe3+などを含む。Fe2+/(Mg+Fe2+)比が0~0.1のものをエンスタタイト,0.1~0.3のものをブロンザイトbronzite(古銅輝石ともいう),0.3~0.5のものをハイパーシンhypersthene(シソ輝石ともいう),0.5~0.7のものをフェロハイパーシンferrohypersthene(鉄シソ輝石ともいう),0.7~0.9のものをユーライトeulite,0.9~1.0のものをフェロシライトferrosilite(鉄ケイ輝石ともいう)と呼んでいるが,最近では0.1~0.9のものを総称してハイパーシンと呼ぶこともある。また,かつては隕石ではブロンザイトとハイパーシンとの境を0.8に置いていたが,最近は誤りやすいのでその分類は用いられない。… ※「bronzite」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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