Obsidian is a naturally created glass and these great obelisks have silver obsidian streaks running through them. 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 and resonates with the Fire element. Approximately .85-1.0lb sizes, shapes and inclusions will vary piece to piece.