Obsidian Chunk Raw/ Rough 0496 (Approx. 2 1/2' - 3 1/2”) Obsidian is truth-enhancing. A strongly protective stone, it forms a shield against negativity. It blocks psychic attack and absorbs negative energies from the environment. Obsidian draws out mental stress and tension. ... Obsidian dissolves emotional blockages and ancient traumas. stonepathtrading.com