Sandfulgurit formed when lightning strikes the desert, the heat melts the sand, forming tubular network of fused sand (Fulgurite).
When the sand dunes move is broken parts and the fulgurite they get their typical appearance. There are also often called the petrified lightning / petrified lightning. Fulgurite name comes from the Latin word Fulgur which means lightning. Fulgurite is a variant of mineraloiden Lechatelierit which is a geoligiskt glass.