A preparation sufficing for most purposes is obtained by digesting the commercial article in absolute alcohol, decanting and evaporating the solution to dryness and fusing in silver vessels.
Manganese dioxide, or pyrolusite (q.v.), Mn02, the most important oxide, may be prepared by heating crystallized manganous nitrate until red fumes are given off, decanting the clear liquid, and heating to 150 0 to 160° C. for 40 to 60 hours (A.
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