Cobalt is a metal used to create tools and weapons. In Minecraft, you can use it in many ways. One of the ways is using it to make cobalt blue blocks and tools
Cobalt is found in the Nether. It is found in the same area as gold, so if you mine some of that too, you'll have plenty of cobalt to go around
You can make cobalt blue blocks by combining a diamond block with a regular block. When you do this, the resulting block will be lighter than a normal diamond block and have a different texture. You can also use this method to make tools and weapons out of cobalt blue materials.
how to forge cobalt blue metal