Rainbow Obsidian

For the colors that only show when the light hits just right.

Rainbow Obsidian is black volcanic glass whose surface reveals soft iridescent bands of green, violet, gold, and blue when the light catches at the right angle. The sheen comes from aligned nanocrystals of magnetite inside the glass. Traditionally associated with grief processing, emotional layers, and the patient uncovering of what's been hidden. Mexico is essentially the only commercial source.