"Metal vibranium" refers to a fictional and highly rare metal in the Marvel universe, known for its unique properties such as being extremely strong and able to absorb vibrations and energy. Full definition
Captain America Super Tech: The Captain's shield, made of an alloy with the alien metal vibranium, absorbs kinetic energy — so the strain of battle only makes it stronger. (discovermagazine.com)
He must also deal with Klaue (Andy Serkis), who stole a supply of Wakanda's valuable, powerful metal vibranium and killed many in his wake. (combustiblecelluloid.com)
The world's most prosperous nation thanks to its resource in the virtuous metal vibranium, the fictional kingdom has ingeniously managed to conceal its reality to the rest of the world by posing as just another poor African country. (reverseshot.org)