Iron-rich sedimentary rocks - WikipediaThe main iron ores are from the oxide group consisting of hematite, goethite, and magnetite. The carbonate siderite is also typically mined. A productive belt of.oolitic hematite goethite magnetite siderite iron ore,Iron Ore - Mining Artifacts - HomesteadThe iron itself is usually found in the form of magnetite (Fe3O4), hematite (Fe2O3), goethite, limonite or siderite. Hematite . Minnesota's iron ore was actually discovered while prospectors were searching for gold. Since the . These are magnetite, titanomagnetite, massive hematite and pisolitic ironstone deposits. Hematite.
oolitic hematite goethite magnetite siderite iron ore