Black Obsidian forms from molten lava that cooled very quickly and had no time to form into glass. It is said to be a type of volcanic glass, and is found in a number of places worldwide.
 
Obsidian is a very protective stone,  and is excellent for removing negativity. It is also excellent protection against psychic attacks. It is a very grounding stone and excellent manifestation stone. Physically it is said to benefit the stomach, intestines, muscle tissue, and can rid one of bacterial or viral infections.  It sharpens and focuses internal and external vision, and helps get in touch with buried issues before they explode.
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This 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.
 
Black Obsidian helps to aid past life healing.
The vibration of this stone is used with the root chakra to promote grounding and has a strong vibration to aid the receiving of answers to questions.