Title: Manganese Sesquioxide CAS Registry Number: 1317-34-6 Molecular Formula: Mn2O3 Molecular Weight: 157.87 Percent Composition: Mn 69.60%, O 30.40% Literature References: Occurs in nature as the mineral manganite, Mn2O3.H2O. Prepn: Moore et al., J. Am. Chem. Soc. 72, 856 (1950). Properties: Black, fine powder. d 4.50. Insol in water. Sol in HCl with evolution of chlorine. Density: d 4.50

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