This Fulgurite specimen measures 37x20x13mm and is a unique and interesting addition to any stone collection. Formed by lightning striking sand, these natural formations are composed of almost pure silicon dioxide. They get their name from the Latin word for lightning, 'fulgur'. Fulgurites have been found worldwide, but are relatively rare. Fulgurite is also known as "fossilized lightning". Don't miss out on this fascinating piece of nature's art.