2 cm. The brother of our vltavín. The name comes from the Greek tektos - molten. Tektite has such a character. Today it is known that it was formed when a rock with a high content of silica and also with a fairly high content of free quartz was suddenly melted in a place where the oxygen content was low, where there was weightlessness and where there was a high vacuum. In some places, the tektites had to fly through an atmosphere of a certain density immediately after their formation, because this is the only way to explain their flattening. The formation of tektites would be possible e.g.