Fulgurite, also known as "petrified lightning," is a natural glassy material formed when lightning strikes sand, creating hollow tubes. The actual appearance may vary slightly from the images shown. You will receive one Fulgurite specimen, the actual appearance may vary slightly from the images shown but will measure approximately 4.5 - 6 cm and weigh approximately 0.8 - 3 grams, delivered in a decorative plastic display frame.