Sunday, July 7, 2013
The strange looking sand formation above is called a fulgurite. Also known as petrified lightning, fulgurites are formed when lightning instantaneously melts the mineral grains in sand and fuses the grains together. The result is a hollow glassy tube with a root-like appearance.The estimated temperature required to create a fulgurite varies, but it is believed to be between 1500 °C to 4000 °C. Their size can range from just a few centimeters to several meters long. The longest fulgurite on record is 4.9 meters.