gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1968.283.036.09 Oriented Transformations in the System MnO-O-H2O Dent Glasser Lesley S. Smith Ian B. 1 Department of Chemistry, University of Aberdeen

Present address: National Research Council, Atlantic Regional Laboratory, Halifax, Nova Scotia.

 9 1968 36 283 976 987 20 3 1968 Copyright © 1968, The Mineralogical Society 1968 Summary

Extensive studies on oriented reactions in the system MnO-O-H2O have revealed surprising symmetry changes, which we have been unable to explain. Orientation relationships are often complicated, but where interpretation is possible, the results support the idea that orientations are controlled by the oxygen frame-work and that considerable migration of manganese occurs.