obsidian   (Sound)

The obsidian has 1 Senses.

• obsidian
• 黒曜石
• acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces
• 結晶化されず、溶岩の迅速な冷却によって形成される酸性または花崗岩のガラス