Luonnonlasina
Luonnonlasina, also known as natural glass, is a type of glass that is formed by natural processes, rather than through human-made methods. It is typically found in volcanic regions, where the intense heat and pressure of volcanic activity can cause silica-rich materials to melt and then cool rapidly, forming glass. The most well-known examples of natural glass are obsidian and pumice.
Obsidian is a type of volcanic glass that is formed when lava with a high silica content
Pumice, on the other hand, is a type of volcanic glass that is formed when lava with
Natural glass can also be formed in other ways, such as by lightning strikes or meteorite impacts.