Obsidian (English name: Obsidian) is a common black gem and volcanic crystal, also known as "Dragon Crystal, Ten Victory Stones". It is a naturally occurring silica, usually dark black. Since ancient times, obsidian has been regarded as an evil spirit and amulet among Han people. Obsidian is one of the gems of Buddhism for making beads and handicrafts. In Chinese traditional folk customs, obsidian is usually combined with brave martial arts to make various ornaments and ornaments, which can be worn or placed at home to make money, transport, ward off evil spirits and house. At present, the effect of being brave is obvious. At present, most obsidian jewelry is produced in Central America and North America, and the national stone of Mexico is obsidian.

Obsidian is formed by the sudden cooling of magma from volcanic lava in water. The magma around the lava flow cools and condenses rapidly when it meets seawater, and the crystal structure does not have enough time to grow. Magma rapidly cools to form natural glass, which belongs to impure crystal gem, and its main component is silicon dioxide (SiO2).