Translation guide
A dark, glassy volcanic rock. In Japanese, it is most commonly referred to as 黒曜石 (こくようせき).
Referring to the volcanic glass obsidian in geological, archaeological, or everyday contexts.
The standard term for obsidian. Used in science, archaeology, and when discussing the material itself.
この矢じりは黒曜石でできている。
This arrowhead is made of obsidian.
黒曜石は火山ガラスの一種です。
Obsidian is a type of volcanic glass.