Obsidian is a very protective stone, and is excellent for removing negativity. It is also excellent protection against psychic attacks. In particular obsidian protects the gentle from abuse, and is used to cut attachment cords to release one. It is a very grounding stone, and very healing. Obsidian is also an excellent manifestation stone.
Black obsidian is a powerful and creative stone. It grounds the soul and spiritual forces into the physical plane, bringing them under the direction of the conscious will and making it possible to manifest spiritual energies on earth. Self control is increased by using this stone. Forces you to face up to your true self, taking you into your subconscious mind in the process. It brings imbalances to the surface so that they can be released.
1.5 – 2.5 inches