2.5-3 inch tower
Black Obsidian is said to absorb negative energy, after which it can be cleaned and used again, although some working call to bury the used stone off of your property to ensure the absorbed negativity is gone to stay.
Awaken the gift of prophecy, reveal insecurities, fears, and problematic behaviors so that you can understand & see them clearly. Proides protection to you as you travel the spirit realm. Allow you to access your psychic abilities. Provide protection during contact with guides,and while communicating with the spiritual world. Assists with  shadows and traumatic events from your past.