Iron ore
From Cantr II Wiki
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Made by crushing either hematite, magnetite or taconite on either a stone table or work bench using either a hammer (stone, bronze or regular hammer) or sledgehammer (sledgehammer or bronze sledgehammer). Please note the hammers and sledgehammmers are not interchangeable in crushing projects.
Used for making iron in a smelting furnace or primitive smelting furnace.