Obsidian (Obsidian) is a common black medium and low-grade gemstone, also known as natural glass, is a naturally occurring glass. Produced in the United States, Japan and Indonesia and other places. In the crystal family, obsidian is extremely powerful in removing negative energy from thermal power plants. Among the ancient Chinese Buddhist cultural relics, there are quite a few obsidian sacred objects or Buddha statues related to town houses or warding off evil spirits. Obsidian is also the best gemstone for Buddha's practice and offering.