Fulgurite is a rare, naturally occurring glassy tube formed when lightning strikes sandy or rocky terrain. The intense heat from the lightning melts the surrounding material, creating a hollow, glassy structure. Fulgurites can be found in areas with high lightning activity and are prized by collectors for their unique formation and rarity. They're like nature's own lightning sculptures! It's all about that intense heat and energy creating these unique, glassy tubes. Pretty cool stuff! This item comes with certificate of authenticity. Thanks for your interest.