Ice obsidian is an obsidian from Iceland's Hekla volcano, which is a mineral produced by volcanic eruption during the Ice Age. Old pit ice obsidian refers to the old mine obsidian produced by the old and thin stone pit mouth, which is delicate in texture. This obsidian often has a certain degree of transparency. In natural light, it is a pure black belt with a relatively positive color, and it appears soft brown light or caramel light after strong light irradiation.