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Topotaxy in the system MnO-O-H2O: groutite–ramsdellite–pyrolusite

Published online by Cambridge University Press:  14 March 2018

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

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 270 , June 1965 , pp. 327 - 334
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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