The synthesis of birnessite, cryptomelane, and some other oxides and hydroxides of manganese

1971/12/01 by R. M. McKenzie

paper · doi:10.1180/minmag.1971.038.296.12

crossref issued 1971/12/01 · crossref published 1971/12/01 · crossref published-print 1971/12/01 · crossref created 2006/12/08 · crossref published-online 2018/07/05 · crossref deposited 2021/02/05 · crossref indexed 2026/07/29

Abstract

Summary Detailed methods are described for the laboratory preparation of the manganese minerals manganosite, hausmannite, manganite, partridgeite, birnessite, cryptomelane, pyrolusite, and todorokite. New data are presented on the conversion of birnessite to cryptomelane, and on the exchange properties of potassium in these two minerals. It was found that the upper limit of potassium in cryptomelane is about 7 % K, while the lower limit lies between 0·25 % and 2·2 % K.

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