Obsidian (English name: Obsidian) is a common black gem and volcanic crystal, also known as "Dragon Crystal" and "Ten Victory Stone". It is a naturally occurring silica, usually black. Obsidian has been used as an evil spirit and amulet since ancient times.

Obsidian can be processed into handicrafts. In addition, obsidian has the characteristics of glass, and its cross section is shell-shaped and very sharp. At present, most obsidian jewelry is produced in Central America and North America, and the national stone of Mexico is obsidian. China also produces obsidian, such as some places in Tibet.

Extended data:

Classification of obsidian

1, obsidian: accounting for 20% of the total color ratio;

2. Green obsidian: accounting for 25% of the color of obsidian;

3. Blue obsidian: accounting for 20% of the color ratio;

4, ghost fairy blue-eyed obsidian; The color ratio of 0.026% is even more rare;

5. Red obsidian: 15% color ratio;

6, ghost fairy red-eyed obsidian; The color ratio of 0.025% is even more rare;

7. gold placer Obsidian: 13% color ratio;

8. Obsidian from Tibet: The color ratio is 10%, and the color in obsidian is lower than 1%, which basically belongs to a rare obsidian variety.

Baidu Encyclopedia-Obsidian