Fulgurite

Fulgurites are a very mysterious natural phenomenon. These are long cylindrical formations, usually black, sometimes can be pale gray, and are glass or silicon tubes of various sizes and cross-sectional thicknesses. Fulgurites are unique in their structure, because each specimen has a different wall thickness from its neighbors, forming a tree trunk. The length of the fulgurite's trunk is unknown to almost no one, there are not even guesses. It is only known that some specimens can be tens of meters or more in length. The fulgurists who collected them divided them all into several types, for example: stepped, thread-like, slightly flattened, straight, curved. Fulgures can appear on the surface of the earth not only in the form of string-cylinders, but also in curved branches. Their shape and size depend on their origin. Presumably, fulgites are fragments of giant glassy bodies that grew at the beginning of the formation of the planet and became harbingers of future volcanoes. The age of the fulgurate is almost equal to the age of our planet.