Obsidian

A strongly protective stone, Obsidian forms a shield against negativity, providing a grounding cord from the base chakra to the center of the earth. It absorbs negative energies from the environment and  blocks  psychic attacks and negative spiritual influences. Obsidian brings clarity to the mind and clears confusion  and constricting beliefs but makes it absolutely clear  what lies behind mental distress or disease. (Judy Hall)

Zodiac: Sagittarius