obsidian stone

Obsidian (/ ə b ˈ s ɪ d i. rock vs stone ən, ɒ b-/) is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. samudra 99 stone It is an igneous rock Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium