Fulgurites (IMAGE) University of South Florida Caption These are fulgurites collected from the field area in Polk County, Florida. Surficial differences likely result from different initial physical conditions (e.g., percent of water in the sand). Credit Dr. Matthew Pasek/University of South Florida Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.