In the 616 universe wasn't it a super expensive to make man made alloy that the us government keeps the formula a secret? Or in this universe it's like in the movies and it does come from space?
Adamantium
is a man-made alloy and only a very small handful of people in the 616 universe are aware of the complete formula.
There are also several variations in 616.
- Proto-adamantium - What Captain America's shield is made from. It's the original adamantium and has never been replicated. It is truly considered indestructible (the five times the shield had been broken all involved god-like powers).
- True Adamantium - this is what was used on Wolverine. Not as strong or as durable as Proto-adamantium, it is able to be reproduced, though at very high costs. This recipe is what the US keeps secret.
- Secondary Adamantium - easier to work with, much more cost effective, but it comes at the cost of the material being much weaker. Characters with considerable superhuman strength, such as Thor, can break it or warp it by going all out.
- Adamantium Beta - only found in Wolverine. His healing factor caused a molecular change in the True Adamantium, meaning that it doesn't inhibit the biological processes of bone.
- Carbonadium is also here even though it is less durable than True Adamantium, it is nearly indestructible and was developed by the USSR to counter Adamantium. Its a radioactive metal that is stronger than steel and was more malleable (and cheaper) than adamantium.