Topotaxy in the System MnO-O-H2O: Groutite-Ramsdellite-Pyrolusite

L. S. Dent Glasser and Ian B. Smith
Department of Chemistry, University of Aberdeen

Summary: X-ray and thermal studies in the system MnO-O-H2O show that the transformations groutite(α-MnOOH)-ramsdellite(MnO2)-pyrolusite(MnO2) are topotactic, with the a, b, and c directions of all three corresponding. The reactions proceed by migration of manganese atoms and, where appropriate, protons. Pure single crystals of ramsdellite could not be prepared by heating groutite, even though the two structures are very similar.

Mineralogical Magazine; June 1965 v. 35; no. 270; p. 327-334; DOI: 10.1180/minmag.1965.035.270.06
© 1965, The Mineralogical Society
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