Obsidian is formed from volcanic activity. Obsidian is extremely powerful, and is the best crystal to protect you from negative energy of all kinds. It transmutes negative to positive. This stone helps with manifestation and attracting things into your life. It is one of the top stones for gazing, and a large obsidian mirror was used by Nostradamus.
Obsidian can be found in solid black or with clarity in a form known as Apache's Tears. it also comes in exciting patterns of rainbows, snowflake, mahogany, silver or gold sheen, midnight lace and blue spiderweb.