Obsidian Palmstone Large3. 2 H x 2. 3 W A large obsidian palmstone is a smooth and polished piece of obsidian, a type of volcanic glass. It is usually shaped into a disc or oval, and is used as a calming and soothing tool to help ease stress and anxiety. The stone is often used in meditation, as the smooth and glossy surface can help to create a peaceful, calming atmosphere. It is also believed to assist in spiritual healing, helping to bring balance and harmony to the mind