Name: Ingots (Iron, Gold)
Source: Player, Crafting Table, Furnance
Stackable/Qty: Yes (64)
Furnance: 1 Raw Iron/Gold Block –> 1 Iron/Gold Ingot
Crafting Recipe: 9 Ingots
While a block is a best way to store Iron, you can convert blocks back to ingots (or diamonds) by using a crafting table, block apply to Iron, Gold, & Diamonds.