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Mineralogy of manganese dendrites and coatings

Potter, Russell M. and Rossman, George R. (1979) Mineralogy of manganese dendrites and coatings. American Mineralogist, 64 (11-12). pp. 1219-1226. ISSN 0003-004X. http://resolver.caltech.edu/CaltechAUTHORS:20130514-075425570

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Abstract

Infrared spectroscopic study of desert varnish, manganese dendrites, river deposits, and other manganese oxide concentrations of the terrestrial weathering environment has shown that the morphological distinctions among them have a sound basis in differences in their mineralogy. The manganese oxide in manganese dendrites collected in surface exposures is either romanechite or a hollandite-group mineral. These are mixed with varying amounts of silicate minerals, which are a passive substrate for the oxide deposition. Dendrites collected in underground mine workings are todorokite. Manganese stream deposits are generally birnessite with minor amounts of silicate minerals; one nsutite stream deposit has been identified. Crack deposit mineralogy resembles that of manganese dendrites. Cave and subglacial deposit mineralogy resembles that of manganese stream deposits. Although dendrites have long been considered to be pyrolusite, no example of pyrolusite mineralogy has been identified.


Item Type:Article
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http://www.minsocam.org/msa/collectors_corner/amtoc/toc1979.htmPublisherUNSPECIFIED
Additional Information:© 1979 Mineralogical Society of America. Manuscript received, January 2, 1979; accepted for publication, February 11, 1979. We thank the following for providing samples: J. Bard, Lawrence Berkeley Laboratory; A. Bauman, Jet Propulsion Laboratory; R. Carpenter, University of Georgia; M. Furst, California Institute of Technology; B. Hallet, Stanford University; J. Hayden, Tucson, Arizona; A. Jelinek, University of Arizona; B. Kisner, Hollywood, California; K. Nealson, Scripps Institution of Oceanography; G. Nowlan, U. S. Geological Survey; R. Perry, University of Washington; R. Sharp, California Institute of Technology; R. Stoessel, Exxon Production Research, Houston, Texas. A portion of the funding for this work was provided by the L. S. B. Leakey Foundation and the John A. McCarthy Foundation.
Funders:
Funding AgencyGrant Number
L. S. B. Leakey FoundationUNSPECIFIED
John A. McCarthy FoundationUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences3153
Record Number:CaltechAUTHORS:20130514-075425570
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130514-075425570
Official Citation:Mineralogy of manganese dendrites and coatings Russell M. Potter and George R Rossman 1219-1226, 1979
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38477
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 May 2013 15:19
Last Modified:13 Feb 2019 18:05

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