Ignatium

 Ignatium  is a metallic substance that naturally forms on Igneus near, around and inside its volcanoes. It has a burning point of 3600 celsius, and a boiling point of 9000. It has a unique quality in that when exposed to the right amount of pressure or when shattered, it ignites itself making it a very viable alloy to use for armor-piercing weapons and projectiles. In its liquid form it is highly flammable and volatile, named Ignatius Acid  making it suitable for use in explosive concoctions as well a good basis for weaponry.