Black Obsidian Silicon Dioxide: 70-75% SiO2+25-30% MgO and Fe3O4 Mohs: 5-5.5 Black Obsidian is a natural volcanic glass formed from molten lava that cools very rapidly. Black Obsidian is a grounding stone that provides an instant connection from the Root Chakra deep into the core of the Earth. Black Obsidian will help to clean and remove negative energies in a sacred space or environment. It also assists in releasing those emotions/reactions that cause negative energy such as anger, jealousy, greed, resentment, etc. Once these energies are removed/released, Black Obsidian will help to keep the space protected. Place Black Obsidian in a home, office, or sacred space to remove any unwanted energies and keep the area free of negativity.