Lightning Can Create Glass Tubes

Imagine capturing a bolt of lightning in solid form. That's essentially what a fulgurite, or "petrified lightning," is. When a powerful lightning bolt discharges into sandy or silica-rich soil, the incredible energy release creates a moment of extreme heat. This happens in a fraction of a second, as the bolt's temperature—exceeding 30,000 Kelvin, several times hotter than the surface of the sun—instantly vaporizes a central channel while fusing the surrounding silica grains into a glassy tube. The result is a fragile, hollow structure with a rough, sandy exterior and a surprisingly smooth, glassy interior.

These natural glass tubes can branch out and extend deep into the ground, sometimes up to 15 feet, perfectly preserving the intricate, root-like path the electricity took as it dissipated. Known since ancient times and named from the Latin word for lightning, *fulgur*, these formations are more than just geological curiosities. Scientists study fulgurites because they can trap atmospheric gases in bubbles within the glass, providing a unique snapshot of Earth's atmosphere at the exact moment the lightning struck. They are, in essence, a fossilized record of a weather event that lasted for only a microsecond.