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magnetite hematite limonite and siderite are ores. Magnetite, Hematite, Limonite And Siderite , How is Iron Refined From the Ore? -, least 3500 years ago Iron is a Magnetite, Hematite, Limonite And Siderite Are Ores Of Which Metal metal which cannot be found .
NOTE: The 'hematite' used in jewelry, and often sold as magnetized items, is nothing of the sort and is an artificially created material, see Magnetic Hematite. In an experimental volcanic gas condensation by Africano et al. (2002) it deposited in high fO 2 conditions during cooling from ca. 800°C down to ca. 650°C.
The "not really a true mineral" known as Limonite is a mixture of hematite, Goethite, and possibly other similar hydrated oxides and hydroxides. Hematite is a primary component of ordinary rust, but the porousity, softness, and flakyness of rust is likely due to goethite.