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American Mineralogist; November-December; v. 88; no. 11-12; p. 1697-1702
© 2003 Mineralogical Society of America
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Woodruffite: A new Mn oxide structure with 3 x 4 tunnels

Jeffrey E. Post1,*, Peter J. Heaney2, Christopher L. Cahill3,4 and Larry W. Finger4

1 Department of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560-0119, U.S.A.
2 Department of Geosciences, 309 Deike, Pennsylvania State University, University Park, Pennsylvania 16802-2714, U.S.A.
3 Department of Chemistry, The George Washington University, Washington, D.C. 20052, U.S.A.
4 Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015-1305, U.S.A.

Correspondence: * E-mail: post.jeffrey{at}nmnh.si.edu

The mineral woodruffite, Zn2+ (Mn4+1–x Mn3+x)O2 · yH2O, x ~ 0.4 and y ~ 0.7, is the first known example of a new type of Mn oxide characterized by large tunnels that measure 3 and 4 octahedra (6.9 x 9.2 Å) on a side. These tunnels are rectangular in cross-section and are the largest of any yet reported in natural or synthetic Mn oxides. The thermal stability of woodruffite is comparable to that of todorokite and other large-tunnel Mn oxide phases, breaking down at ~300 °C and eventually transforming to a spinel-type structure. The woodruffite structure may serve as a model for a new class of octahedral molecular sieves with enhanced capabilities as catalysts and selective cation-exchange agents.




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A Short Outline of the Tunnel Oxides
Reviews in Mineralogy and Geochemistry, January 1, 2005; 57(1): 291 - 305.
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