Now, I know ores aren't my job, but I do have a few nitpicks with it...
Greystone: I noticed the description said it was very light, while also saying it was lead. Lead is actually very very heavy.
Bronze: bronze is not a naturally occuring metal, but a tin and copper alloy. is slowsilver tin?
Ebony: If Ebony is not harder than Iron, it cannot be sharper. [i]Buuut[/i] harder things arre more brittle, so that will keep it balanced.
Adamantium and Mythril: Not actually a nit pick but what if you had a thin layer of mythril over adamant plates? That could potetially be overpowered.