Manganese violet is the inorganic compound called ammonium manganese(III) pyrophosphate. The formula indicates that pyrophosphate (P 2O4− 7), ammonium (NH+ 4), and manganese(III) make up this solid. It is prepared by heating a mixture of Mn 2O 3, diammonium phosphate and phosphoric acid. This material is a popular inorganic pigment.
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