ferrohypersthene

...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 "ferrohypersthene" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…ほかに少量のCa,Al,Ti,Mn,Fe^3＋などを含む。Fe^2＋/(Mg＋Fe^2＋)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。…

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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