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Characteristic : it is pale pink, granular powder.it is freely soluble in water,but is insoluble in alcohol. odorless ,the relative density is 2.95. it starts loss crystal water when heated higher than 200℃, loss all crystal water when 280℃,and can be salt melt anhydrous when 700℃;decomposing when 800℃ and will have insoluble back residue called mn3o4 ,totally decompose in 1150℃