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Manganese minerals in geodes from Chihuahua, Mexico1

Published online by Cambridge University Press:  05 July 2018

Robert B. Finkelman ,
Howard T. Evans Jr  and
John J. Matzko
Robert B. Finkelman
Affiliation:
U.S. Geological Survey, Washington, D.C. 20242
Howard T. Evans Jr
Affiliation:
U.S. Geological Survey, Washington, D.C. 20242
John J. Matzko
Affiliation:
U.S. Geological Survey, Washington, D.C. 20242
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Summary

Seven manganese minerals have been observed in geodes from Chihuahua, Mexico. Ramsdellite occurs in a number of different habits, but the morphology and precession X-ray patterns suggest that it is pseudomorphous after groutite. Pyrolusite is found only in association with rams-dellite and is believed to be an alteration product of that mineral. Todorokite generally occurs as a late-stage fibrous overgrowth in many of the geodes. Ranciéite, birnessite, hollandite, and cryptomelane are present in trace amounts. This assemblage of manganese minerals is typical of supergene mineralization.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 305 , March 1974 , pp. 549 - 558
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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