Conchoidal fracture

What Is Obsidian Good For

What is an obsidian used for? What is obsidian used for? Obsidian has been used across history to make weapons, … More

Is Obsidian Mafic

Is obsidian mafic or ultramafic? Classification of Igneous Rocks Why is obsidian not mafic? Obsidian is a naturally occurring volcanic … More