“Black Obsidian Stone is a powerful cleanser of psychic smog created within your aura, and is a strong psychic protection stone. It has powerful metaphysical properties that will shield you against negativity, and their energy may stimulate the gift of prophecy. It an excellent crystal to use when you have been doing spiritual or healing work… as it grounds you to Mother Gaia. This black stone is excellent to assist you to release disharmony that has built up in your day to day life and during work on yourself, including resentment of others, fear and anger. These are very helpful stones if you are doing any type of work involving contact with the spirit world as they are highly protective. These black stones are one of the premier crystals to assist you to communicate with spirit and may bring through the power of prophecy.
Black Obsidian Stone is also an excellent aid to help you to release any negativity that your day to day life may have caused. This negativity may be present within your auric field and needs to be removed… to aid your ongoing physical, emotional and spiritual health. This stone acts to remove any built up negativity caused by your own or others anger, fear, resentment and even stress… as well as aiding you to remove any negative attachments. These stones may assist you to seal your aura against future problems… and may aid you unfetter yourself from any negative attachments that you may have unintentionally taken into your aura. They are a strong psychic protection stone, and will benefit you by shielding you from all negativity… so they are very helpful stones to keep within your auric field. Their resonance within the base chakra is very strong. They have a strong vibration that aids spiritual grounding, by helping you to move any excess energy down via the earth chakra to Mother Gaia for grounding.” ~http://www.healing-crystals-for-you.com/obsidian-stone.html