Obsidian resonates with the Base Chakra and the Zodiac's of Scorpio, Sagittarius.
 
Black Obsidian is a very powerful and creative stone.  It increases self-control.  It forces facing up to one’s true self.  Releases imbalances and negative energies.  Black Obsidian is protective and provides support during change.  It repels negativity and disperses unloving thoughts.
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.  It stimulates growth on all levels, urging exploration of the unknown and opening new horizons.  Brings clarity to the mind and clears confusion.  Helps you to know who you truly are.  Obsidian dissolves emotional blockages and ancient traumas.  Promotes qualities of compassion and strength.
 
Obsidian aids the digestion and detoxifies.  It reduces arthritis pain, joint problems and cramps.  Warms the extremities.