Obsidian is an excellent grounding, protection and transmutation stone. Obsidian stimulates visioning during meditation. Blue Obsidian stimulates and enhances all forms of communication and lingual skills, when used at the throat chakra. Blue Obsidian aids divination, psychometric and psychic development pursuits. 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.