Obsidian

Obsidian is a common black gemstone, volcanic crystal, a naturally occurring silica. 
 

Origin of Obsidian 
Most of the Obsidian is distributed in areas with volcanic activity, such as Hawaii, Japan, and Indonesia's Java Island. Others include Iceland, Hungary, Italy's Lipari Islands, the former Soviet Union, and Mexico (the national stone of Mexico is obsidian), Ecuador, Guatemala, and China's Tibet also. 

Common Obsidian Species 
Ordinary Obsidian, rainbow eye Obsidian, gold Obsidian, ice black Obsidian and so on. 

Use of Obsidian 
Obsidian has been used as an amulet since ancient times. In ancient Chinese Buddhist relics, there are many Obsidian relics and various Buddha statues. In traditional Chinese folklore, Obsidian and Pixiu elements are often used to make various ornaments, for wearing and placing in the home. 
In the Mayan temple in Mexico, Obsidian is often used as the eye of a beast and statue, or as a weapon, and for Mexicans, Obsidian has a special divinity, so it is the best instrument used for divination. 

The Legend of Obsidian - A Gem That Does Not Cry 
Obsidian is also called "the tears of Apache" by the Indians. It is said that whoever has this black Obsidian will never have to cry again, because the girls of Apache have already drained all the tears for you. Give Obsidian to someone you like, you will no longer cry and always be happy.