Golden Obsidian Natural 6mm Round Large Hole Beads - 8 Inch Stone Type_Boulder Opal or black and can be

or black and can be distributed randomly or in bundles or star to like formations

rainbow effect of light refracting off of the air bubbles inside of the stone

after its type locality

It is often thought of as an all-black stone

Red Botswana Agate displays highly defined parallel banding

Golden Obsidian Natural 6mm Round Large Hole Beads - 8 Inch Stone Type_Boulder Opal or black and can beGolden Obsidian is a naturally occurring volcanic glass, shiny black with a golden sheen. Obsidian is produced when lava erupts from a volcano and cools rapidly with minimal crystal growth. It is sometimes used for scalpel blades in cardiac surgery, as Obsidian can be formed into a blade many times sharper than steel surgical blades. Approximate Hole Diameter: 2mm