Achroite - Achroite

Japanese: アクロアイト - あくろあいと
Achroite - Achroite

...In addition, even in single colors, there are ones that are colorless, red, yellow, green, blue, purple, brown, and black. The most typical one is green tourmaline, but there are also other names such as red or pink rubellite, dark blue indicolite, colorless achroite, and black schorl. It has pyroelectric properties, which means it becomes electrically charged when heated, and the Japanese name "tourmaline" comes from this property.

*Some of the terminology that mentions "Achroite" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また単色でも,無色から赤,黄,緑,青,紫,褐色,黒までの色をもつものが見られる。代表的なものは緑色のグリーン・トルマリンであるが,赤ないしピンクのルーベライトrubellite,濃青色のインディコライトindicolite,無色のアクロアイトachroite,黒色のショールschorlなど,それぞれ別名をもっている。熱すると電気を帯びるピロ電気性があり,和名の電気石はこの性質に由来する。…

※「アクロアイト」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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