Obsidian is a glassy, silica-rich volcanic rock with a hardness of 5 to 5.5. It is an amorphous stone, meaning that its structure contains no regular geometric pattern. Because it breaks with a very sharp conchoidal fracture, it has been used for making arrowheads and other tools since Paleolithic times. The name Obsidian is derived from the name of the prominent ancient Roman, Obsius. Obsidian is most frequently black or very dark brown, but it can also be gray or green.
Black Obsidian is a pure, glossy black color, which can appear as very dark brown when strong light is shined on thin edges.
Black Obsidian powerfully eliminates negative energies in oneself and one’s environment. It is like a ‘psychic vacuum cleaner,’ cleansing the auric field of disharmony, negative attachments, astral plane ‘junk,’ and one’s own emanations of anger, greed, fear, resentment, etc. It is a strong grounding stone, stimulating the root chakra to make its connection with the Earthstar chakra below the feet, and deep into the core of the Earth. Black Obsidian’s energy is that of protection. Its frequency seals the aura and removes energetic attachments, hooks and cords. Black Obsidian’s energy creates a protective shield that helps one remain centered when faced with negativity. Black Obsidian’s protective energy also extends to the level of the mind, illuminating negative thoughts and mental habits so action can be taken to clear their root causes. It allows one to perceive where one is creating negativity in one’s own life and guides one to change the underlying patterns that create a negative reality. Black Obsidian helps uncover unconscious thoughts and patterns that inhibit one’s spiritual and personal growth
Rainbow Obsidian is black Obsidian that, when and polished and exposed to a strong light source, reveals bands of red, blue, gold and/ or green shades which seem to correspond to layers of molten lava that cooled at different rates or times. Rainbow Obsidian can be utilized to clear the emotional body of lingering patterns of emotional trauma. It is helpful in dissolving outmoded genetic patterns and karma. Rainbow Obsidian is a powerful emotional protector, but one must prepare to process the root causes of emotional distress. Rainbow Obsidian creates a bridge of Light into the dark and painful places of the mind, body and emotions, allowing one to go in and heal them.
Simmons, Robert; Ahsian, Naisha. The Book of Stones, Revised Edition: Who They Are and What They Teach (several pages). North Atlantic Books. Kindle Edition.