Aegirine (English spelling)
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A mineral belonging to the alkali pyroxenes, also called aegirite or aegirine. Its chemical composition is NaFe 3+ Si 2 O 6 , which is a calcium pyroxene Ca(Mg,Fe 2+ )Si 2 O 6 in which the Ca has been replaced by Na and the (Mg,Fe 2+ ) by Fe 3+ . Acmite with the same composition and crystal structure but a different crystal habit is called acmite. It has dark green to black columnar or granular crystals, sometimes with pyramidal tips. Monoclinic threads. Mohs hardness 6, specific gravity 3.5-3.6. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
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アルカリ輝石に属する鉱物で，エジル輝石またはエジリン輝石ともいう。化学組成はNaFe3＋Si2O6であり，カルシウム輝石Ca(Mg,Fe2＋)Si2O6のCaをNa，(Mg,Fe2＋)をFe3＋が置換したもの。同一組成，同一結晶構造で晶癖が異なるものをアクマイトacmite(錐輝石)という。暗緑色～黒色の柱状または粒状の結晶で，先端はピラミッド状を呈することがある。単斜晶糸。モース硬度6，比重3.5～3.6。
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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