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Magnetite

Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe3O4. It is a member of the spinel group and has a cubic crystal structure. It is often found in igneous, metamorphic, and sedimentary rocks, and is typically black or dark gray in color.

Magnetite is magnetic, and its magnetic properties have been known for thousands of years. It was used by ancient civilizations as a compass and for navigation, and is still used today in various applications such as in MRI machines and in the production of steel.