Alumina shale (English spelling)

Japanese: alumina shale(英語表記)aluminashale
Alumina shale (English spelling)

…Shale is called siliceous shale, calcareous shale, tuffaceous shale, etc. depending on the substances it contains. Shale that contains a lot of alumina is called alumina shale, and that which contains petroleum components is called oil shale. Generally, it is black in color because it is rich in organic matter, but when it weathers, it turns dark gray or reddish brown. …

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ケツ岩は含有物質によってケイ質ケツ岩,石灰質ケツ岩,凝灰質ケツ岩などと呼ばれる。また,アルミナの多いものをバン土ケツ岩alumina shale,石油成分を含むものをオイルシェール(油ケツ岩あるいは油母ケツ岩)という。一般に有機物に富むことから黒色を呈することが多く,風化すると暗灰色や赤褐色になる。…

※「alumina shale」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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