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Manganese is a brittle, hard metal that is found as the free element in nature in varying forms. It can also be found in a wide variety of compounds with almost every oxidation state between (II) and (VII+). The chemical properties vary widely depending on the form of manganese. Manganese reacts vigorously with many non-metals at high temperatures. The metal is soluble in dilute, non-oxidising acids, but is insoluble in cold water. Manganese oxide and manganese carbonate are the most commonly used industrially available forms of the mineral, whereas manganese chloride, manganese nitrate, and potassium permanganate are also employed in certain applications.

Manganese acetate is soluble in water, methanol, and acetic acid. It is a pale red, solid material that has the formula Mn(CH3CO2)2n where n = 0, 2, or 4. It crystallises in the monoclinic system and has space group P21/c. Its structure has been investigated by X-ray crystallography.

Manganese is an essential nutrient for plants, animals, & bacteria. It is found naturally in the human diet in small amounts and is not considered to be toxic at normal intake levels. Manganese is an important catalyst for organic synthesis, and it is also used in the manufacture of dyestuffs, fertilizers, glass, porcelain, paints, and coloured glasses. Manganese is a key metal in the production of ferromanganese steel, which is used in carbon and alloy steels to improve strength and hardness. It is also an ingredient in some battery and dry cell batteries, some vitamin and mineral dietary supplements, and some fertilisers.

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