In an LP I was watching, the guy had a texture that replaced all ores that were coal and rarer with the kanji for each ore. However, AFAIK he didn't state where he got it from (other than "the internet"), so I figured I'd ask here.
The one on the left is iron and on the right is coal - as you can see the color is left unchanged.
The one on the left is iron and on the right is coal - as you can see the color is left unchanged.