A pure volcanic rock, is a good crystal for protection and grounding. Black Obsidian Heart is a wonderful cleanser of emotional traumas triggering from past. It helps in bringing peaceful sleep and helps in healing sleeping disorders. As a protection Natural Black Obsidian Heart creates one of the most strong auric protection from psychic attacks and negative energies. Some consider the vibration of obsidian strong enough to bring about the desired change in life to set on a new pattern.