Black Obsidian stone is a powerful cleanser of psychic smog created within your aura. It is a strong psychic protection stone, with powerful metaphysical properties, and it will help to shield you against negativity. It has a good action to cut or sever ties. This will help to break negative attachments to people with whom you have been close. The energy of these stones may stimulate the gift of prophecy and may boost precognition.

Zodiac- Sagittarius & Scorpio

Chakra- Root chakra