Obsidian is a naturally created glass. It is formed form volcanic lava which cooled too quickly for significant crystallization to occur. Black Obsidian is a stone that will assist you in staying grounded, assist unbalanced energy, stimulate your intuition, divination, and to keep your energy clean and protected. Black Obsidian works with the energies of the Root and Earth Chakra. Sold by approximate weight - not stone size or count. From China.