Adamantium is a metal alloy in the Marvel Comics Universe best known for being the substance bonded to Wolverine's skeleton and bone claws. Adamantium is a group of man-made metal alloys of varying durability, but all are nearly indestructible. Adamantium was inadvertently invented by the American metallurgist Dr. Myron MacLain in an attempt to recreate his prior discovery, a unique alloy of steel and vibranium (which required an unknown catalyst for its manufacture).
Before molding, the components of the alloy are kept in separate batches, typically in blocks of resin. Adamantium is prepared by melting the blocks together, mixing the components while the resin evaporates. The alloy must then be cast within eight minutes. Adamantium's extremely stable molecular structure prevents it from being further molded even if the temperature is high enough to keep it in its liquified form. In its solid form, it is dark metallic grey, shiny, and resembles high-grade steel or titanium. It is almost impossible to destroy or fracture in this state and when crafted to a razor edge, it can penetrate most lesser materials with minimal application of strength.
Despite its utility in armament and armature, adamantium is rarely used due to its high cost and inability to be reshaped.