iron oxide black, the chemical formula Fe ₃ O ₄.
Also known as black iron oxide, magnets, magnet, a magnetic black crystals, also called the magnetic iron oxide. Please note that absolutely can not be called a "partial acid ferrous iron" or "partial ferric iron" Fe (FeO ₂) ₂, nor is it a mixture of iron oxide and ferrous oxide. Soluble in acid, insoluble in water, alkali and alcohol, ether and other organic solvents, but the natural iron oxide is insoluble in acid, wet easily oxidized into ferric oxide in the air.
iron oxide black Usually used as a pigment and polishing agents, can also be used to make audio tapes and telecommunications equipment.
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