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A magnesium analogue of chalcophanite in manganese-rich concretions from Baja California

Potter, Russell M. and Rossman, George R. (1979) A magnesium analogue of chalcophanite in manganese-rich concretions from Baja California. American Mineralogist, 64 (11-12). pp. 1227-1229. ISSN 0003-004X. http://resolver.caltech.edu/CaltechAUTHORS:20130514-081805265

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Abstract

Concretions which carry chemical remanent magnetization in sediments in Baja California, Mexico, previously called "hydropsilomelane," were found to consist of siltstone matrix minerals cemented by a manganese oxide. The X-ray powder pattern, infrared spectra, and chemical analyses indicate that the manganese oxide has the chalcophanite structure. The high concentration of magnesium, presumed to occur in the interlayer position of this mineral, suggests that it is the magnesium analogue of chalcophanite and extends the known range of substitution in chalcophanite-structure minerals.


Item Type:Article
Related URLs:
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http://www.minsocam.org/msa/collectors_corner/amtoc/toc1979.htmPublisherUNSPECIFIED
Additional Information:© 1979 Mineralogical Society of America. Manuscript received, December 14, 1978; accepted for publication, March 27, 1979. We thank E. E. Larson (University of Colorado) for the samples of concretions used in this study.
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Caltech Division of Geological and Planetary Sciences3147
Record Number:CaltechAUTHORS:20130514-081805265
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130514-081805265
Official Citation:A magnesium analogue of chalcophanite in manganese-rich concretions from Baja California Russell M. Potter and George R Rossman 1227-1229, 1979
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38478
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 May 2013 15:45
Last Modified:13 Feb 2019 18:05

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