Black Obsidian is often known as the mirror stone, or the stone of truth. It is created when volcanic lava is submerged in water and cools rapidly. Smooth structureless pieces are formed that have an incredible reflective luster, allowing you to see your reflection.
Black Obsidian has been found all over the world. Ancient cultures used this stone to make arrows and spearheads, knives, and other cutting tools. In more recent times it has even been crafted into fine bladed scalpels, although they are not approved for surgical use in humans.