Golden Obsidian Natural 6mm Round Large Hole Beads - 8 Inch Stone Type_Boulder Opal after its type locality

after its type locality

Red Botswana Agate displays highly defined parallel banding

Distinctive for its purple-and-gray tones

but also for industrial purposes from watch gears and scientific instruments to sandpaper and other abrasives

mineral deposits can create stone in the place of the decaying wood

Golden Obsidian Natural 6mm Round Large Hole Beads - 8 Inch Stone Type_Boulder Opal after its type localityGolden 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