Hematite Ore ( Fuel for Iron )

Hematite would easily be found in big open spaces at the top of a stalactite. It would need 2 minecraft days to smelt one Hematite ore. After smelting it you will have a hematite shard, you will need to put it in a crafting table ( in the middle ) and surround it with blocks of coal creating a Hematite Ingot, this would act as an infinite source for smelting iron never ever breaking.

( DOES NOT WORK FOR ANYTHING BUT IRON )