Blue (0;0;255) Metal, there is a lot of metals that are shades of blue but not a single one that is pure blue.
Only suggesting to add this so as to complete the rainbow :P

Possible Names:

• Cobalt - makes sense but the metal is already used by tinkers
• Saphron - a combination of Sapphire and iron
• Skögul - means high-towering in Old Norse, often related to Valkyries and Gods.
• Neptunium - something to do with water, I think.
• ...

(And any other better suggestions not by me)

Skögul - means high-towering in Old Norse, often related to Valkyries and Gods.
but, MAYBE, we'll add it with some mobs (like valkyria)

@PierKnight100 Don't know, this deep blue doesn't seem like it would fit cold theme. Usually "cold" colors are a lot more muted and less saturated than this.

And what if this metal can be a really cold metal? Similar to ice

Skögul Ideas:
Underwater generated high tower, decorated with blocks of this metal
Maybe tools or armor
A throwable weapon / wind effect weapon
Sudying the ingot gathered from the block could unlock a new way to make this material

Added to checklist