Have you ever heard of lightning glass? You may have heard it called by another name, fulgurite. This beautiful material is one that has a mystifying background to how it’s created and the differences between the types of fulgurites.
You might be surprised to know that there are many regions in the United States where lightning glass is located. There also are some incredibly interesting facts that scientists have learned about this material due to intense study of them as well as some mentions in pop culture.
What exactly is lightning glass?
Fulgurites are typically hollow, glass-lined tubes with rough exteriors. They can vary greatly in size and shape, often branching out like the fingers of a hand or forming irregular shapes, depending on the composition of the substrate and the intensity and duration of the lightning strike. The color of fulgurites can range from pale gray or tan to green or black, depending on the minerals present in the sand or soil.
The lightning bolt passes through the sand and melts the silica within it into a liquid form. It cools and hardens fast, then leaves a thin glassy tube behind. The outside typically is rough and the inside is smooth.
When you find fulgurites, they can be shaped like tree roots and trace the zigzag path of the lighting bolt that led to its creation. They can be extremely delicate and have walls that are no thicker than 1 to 2 millimeters. Large fulgurites are sometimes taken from the ground in several pieces, then glued together so that they’re in the original shape.
Fulgurites in the United States
Due to their formation process, fulgurites are found in areas prone to thunderstorms and lightning, especially where loose sandy soils or beaches provide the ideal medium for their creation.
Deserts, beaches, and high mountain areas are places to look for lightning glass. Wherever lightning strikes the ground, there is potential to form fulgurites.
Looking for lighting glass is challenging because of its rare, sometimes delicate nature.
Searching for Sand Fulgurites
Sand fulgurites tend to be rough with some partially melted sand in them. Deeper sand may produce longer tubes of fulgurite up to 30 inches. These tubes of glass that form in the beach sand during a lightning strike are challenging to find.
Extra care should be taken when excavating sand fulgurites. These tubes of lightning glass are very delicate and can break easily. Being aware of this will help you preserve a more complete sample of lightning glass if and when you do find one.
Facts About Lightning Glass
Here are some fun and intriguing things you likely didn’t know about fulgurite.
Fun Facts About Fulgurites
- Natural Lightning Sculptures: Fulgurites are sometimes called “petrified lightning” because they are essentially the frozen evidence of a lightning strike. They form when lightning with a temperature of over 1,800 degrees Celsius (about 3,272 degrees Fahrenheit) hits sandy soil, fusing the sand into glass tubes.
- Where to Find Them: While fulgurites can theoretically form anywhere there is sand and lightning, they are most commonly found in places with frequent thunderstorms and sandy soil, such as beaches, deserts, and sand dunes. Florida, known for its high frequency of lightning strikes, is a hotspot for fulgurite hunters.
- Varied Shapes and Sizes: The size and shape of fulgurites can vary dramatically depending on the strength of the lightning strike and the type of sand involved. Some are just a few inches long, while others can extend several feet below the surface.
- A Source of Scientific Insight: Beyond their awe-inspiring origins, fulgurites are of great interest to scientists studying the conditions and effects of lightning strikes. They can provide clues about the temperature and pressure of a lightning strike and the electrical properties of the strike.
- Fulgurites in Pop Culture: Fulgurites gained some fame from the movie “Sweet Home Alabama,” where a character played by Reese Witherspoon unveils a large, elaborately branched fulgurite as an example of what can happen when lightning strikes sand.
- Collectible Items: Due to their rarity and unique origin, fulgurites are prized by collectors. Each fulgurite is unique, capturing a single, powerful moment of natural energy transformation.
- Challenges in Preservation: Fulgurites are very fragile and can be difficult to excavate without damage. Collectors and museums often go to great lengths to preserve these delicate structures.
