A bloomery is a type of metallurgical furnace once used widely for smelting iron from its oxides.  The bloomery was the earliest form of smelter capable of smelting iron.  Bloomeries produce a porous mass of iron and slag called a bloom.  The mix of slag and iron in the bloom, termed sponge iron, is usually consolidated and further forged into wrought iron. Blast furnaces, which produce pig iron, have largely superseded bloomeries.