Actually, to be a complete nerd, there are two types of Vibranium. There's the Wakandan type, used in Captain America's shield, and then there's the sort found in Antarctica, which breaks down the molecular bonds of other metals (including adamantium), causing them to turn to liquid. This apparently includes the iron in human blood, if a Spider Man story dealing with a Tri-sentinel is to be believed. However, the Antarctic vibranium can be turned into unstable Wakandan Vibranium through particle bombardment.