Axinite (Axe Stone)

Japanese: オノ石(斧石) - おのいし（英語表記）axinite

It is also called "axe". It is a triclinic mineral with the chemical composition Ca ₄ (Fe,Mn) ₂ Al ₂ [B ₂ Si ₈ O ₃₀ ] (OH) ₂ , and was named after the Greek word axinē, which means axe, because of its axe-like crystal shape. It has a vitreous luster and is found in various colors such as brown, purple, and gray, and those rich in Mn are yellow. It has a Mohs hardness of 6.5 to 7, a specific gravity of 3.27 to 3.35, and becomes electrically charged (pyroelectric) when heated to 200 to 300°C. It is found in contact metasomatic deposits and in geodes such as granite.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

〈ふせき〉ともいう。Ca₄(Fe,Mn)₂Al₂[B₂Si₈O₃₀](OH)₂の化学成分をもつ三斜晶系の鉱物で，斧に似た形の結晶形を示すため，斧を意味するギリシア語axinēにちなんでその名が付けられた。ガラス光沢を呈し，褐色，紫色，灰色などの種々の色のものがあり，Mnに富むものは黄色を示す。モース硬度6.5～7，比重3.27～3.35,200～300℃に加熱すると帯電する(ピロ電気)。接触交代鉱床，花コウ岩などの晶洞に産する。

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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