Obsidian

Obsidian is truth-enhancing.  A strongly protective stone, it forms a shield against negativity.  It blocks psychic attacks and absorbs unpleasant energies from the environment. 
Obsidian draws out mental stress and tension.  It stimulates growth on all levels, urging exploration of the Unknown and opening new horizons.  It brings clarity to the mind and clears confusion. Obsidian dissolves emotional blockages and ancient traumas.  Promotes qualities of compassion and strength.

Obsidian Associations
Chakra: Root Chakra
Zodiac: Scorpio, Sagittarius
Element: Earth/Fire
Numerical Vibration: Number 1
Typical colors: Black, silvery, or brown