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

OUTSTANDING OBSIDIAN 🖤 Obsidian is an igneous rock consisting mainly of silicon dioxide, which occurs as a natural glass. It is formed during the eruption of Felsic lava from volcanoes. Because of the high concentration of silica within Felsic lava, the high viscosity coupled with the rapid cooling upon it’s expulsion from the earth inhibits the formation of mineral crystals, allowing instead for a natural glass to form from the lava. The structures that we find within crystalline forms simply