Adamantium is a fiction, not a true mineral.
Adamantium
Diamond. a very hard material that is the hardest substance ever, or at least discover to be the hardest substance on EARTH THAT IS
Adamantium is a made up substance. It doesn't really exist.
A diamond
Diamonds.
On earth, diamond is the hardest naturally occurring substance.
No,diamond is the hardest known substance on Earth.
The hardest substance that is naturally occurring is a diamond. However, there are harder substances that have been made by scientists in labs.
Yes, it is.
diamond
Its Tungsten
diamond