Anorthosite - Shachogan (English spelling) anorthosite

Japanese: 斜長岩 - しゃちょうがん(英語表記)anorthosite
Anorthosite - Shachogan (English spelling) anorthosite
Anorthosite is a leucogranular rock similar to gabbro and norite, but contains very little pyroxene. It is a coarse-grained rock consisting of more than 90% labradorite or bytunitic plagioclase, with small amounts of augite and orthopyroxene, and in some cases olivine. The name anorthosite was given by Hunt [Hunt: 1863]. Turner suggested that rocks consisting of anorthoclase should be called anorthosite, but this was not used [Turner: 1900, Tomkeieff: 1983]. Other names used for coarse-grained rocks consisting mainly of anorthite are anorthite rock and anortholite. Anorthose is an old French name for plagioclase.

Source: Asakura Publishing Dictionary of Petrology Information

Japanese:
斜長岩は斑糲(はんれい)岩やノーライトに近い種類の優白質の粒状岩であるが,ほとんど輝石を含まない.全体の90%以上がラブラドライトまたはバイトゥナイト質の斜長石からなり,少量のオージャイトや斜方輝石を含み,ある場合には橄欖(かんらん)石が含まれる粗粒の岩石.アノーソサイトはフントの命名による[Hunt : 1863].ターナーはアノーソクレースからなる岩石をanorthositeと呼ぶべきであると提案したが,使われなかった[Turner : 1900, Tomkeieff : 1983].主としてアノーサイトからなる粗粒の岩石には,これ以外にanorthite rock, anortholiteという名称が用いられた.フランス語でanorthoseは斜長石の古い呼び方である.

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