Limestone and improved blast furnaces.

Limestone is something that I have wanted since I installed Minecraft. Also, limestone could be smelted in a normal furnace to make lime, which could be used to turn coarse dirt into just dirt, as it does in real life. Blast furnaces could also use limestone, because in real life blast furnaces use carbon and limestone and the ore to make the product.
Thank you for considering this suggestion, have a very good day!