OBSIDIAN FORMATION 🌋 | Saltshack

Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high content of silica, giving them a high viscosity. The high viscosity inhibits diffusion of atoms through

For centuries, civilizations have treasured obsidian. From ancient arrowheads to cutting-edge surgical blades (sharper than steel!), this volcanic glass has a surprisingly rich history and surprising uses. Plus, some pieces glimmer with hidden colors! #Obsidian #VolcanicGlass #Archaeology #SharpBlades #Mineralogy | Mineral Gemstones