Obsidian 黑曜石 / 黑曜岩

Obsidian 黑曜石 / 黑曜岩

Obsidian is a naturally created glass. It is formed form volcanic lava which cooled too quickly for significant crystallization to occur. It is most often black, but colors such as gray, brown, and less likely but evident still is red, blue and green. These colors may be uniform, spotted or banded.