Rainbow Obsidian Tumblestone
Rainbow Obsidian was formed when lava once cooled at different times, and captured Magnetite nanoparticles within these layers. The Magnetite nanoparticles cause multicolored iridescence that shines bright when light hits it.
Please note: As this is a natural crystal/stone, tumbles will vary in colour and pattern. Picture is an example only. I will select a tumble for you.