franklinite

mineral

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In magnetite
franklinite (zinc iron oxide, ZnFe₂O₄), jacobsite (manganese iron oxide, MnFe₂O₄), and trevorite (nickel iron oxide, NiFe₂O₄). All are magnetic, although franklinite and jacobsite are only weakly so; magnetite, which frequently has distinct north and south poles, has been known for this property since about 500…
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