Adamantium vs Vibranium
For those interested:
-Adamantium CAN cut through Vibranium. Adamantium is an order of magnitude more indestructible than Vibranium.
-MCU changed how Captain America's shield works so there is a bit of confusion going on.
-Canon Marvel Universe, Earth-616: Captain America's shield is made of proto-Adamantium, an alloyed mixture of Adamantium and Vibranium, unique to Marvel Earth. Arguably one of the most indestructible items ever created by humanity.
-Marvel Cinematic Universe, Earth-199999: Captain America's shield is composed of a Vibranium-alloy with remarkable properties of durability and energy redirection. While it is not as indestructible as Captain America's Earth-616 version, it can take a strike from Mjolnir and survive.
Types of Vibranium (extraterrestrial metal of unknown origin):
1. Wakandan Vibranium, absorbs vibration and dispels kinetic energy
2. Antartic Vibranium, disrupts metallic structures including Adamantium and is known by another name: anti-metal
Adamanitum (synthetically created metal alloy discovered in an effort to recreate Captain America's shield's uniquely indestructible nature):
-Scientists were unable to recreate what was dubbed proto-adamantium, they did discover the next best thing, Adamantium, the most indestructible metal ever synthesized on Earth.
-Wolverine's claws are composed of Adamantium and are able to cut through almost any known material though his true adamantium degraded to beta once in contact with his healing factor.
Misc.:
-Captain America's shield in the comics is not made only of Wakandan Vibranium unlike the MCU version which IS.
-In the comic Marvel Earth-616, his shield is an alloy of proto-Adamantium, a unique and never again duplicated mixture of Adamantium and Vibranium, making it even stronger than pure Adamantium and giving it special properties neither metal seems to possess, singularly.
-In the most recent storylines of the Avengers comics, his shield was broken and repaired by Asgardian smiths who added a bit of Uru metal to the mixture, thus making it even more unique with a potential to be enchanted.