Economic Iron Bearing Minerals - AZoMiningAug 3, 2012 . Large deposits of haematite are commonly found in banded iron . With a chemical formula of Fe3O4, magnetite is a black mineral and is the.common chemical formula for iron ore,Hematite: The mineral hematite information and picturesHematite is one of the most common minerals. . Non-crystalline forms of Hematite may be transformations of the mineral Limonite . Chemical Formula, Fe2O3.
common chemical formula for iron ore