The Black Obsidian is a protective, grounding, robust and swift acting crystal that provides intense healing. Cats are considered a symbol of healing and associated with Protection. Black obsidian is a natural volcanic glass that has been used for centuries for its healing properties. It is believed to have the power to protect against negative energy and promote emotional healing. Sold: Per Piece Approx. Weight: Sold/lb Size: 1.5-2 inch