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Ferruginous vernadite in an Indian Ocean ferromanganese nodule

Published online by Cambridge University Press:  01 May 2009

J. Ostwald
J. Ostwald
Affiliation:
Broken Hill Proprietary Co. Ltd., P.O. Box 188, Wallsend, N.S.W. 2287, Australia
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Abstract

Select area electron diffraction and microanalysis of the optically dark component of a ferromanganese nodule from the South East Indian Ocean Manganese Field indicate that this is composed of a random stratification of crystallites of vernadite MnO2. (R2O, RO, R2O3)x. yH2O, where R represents elements such as K, Ba, Na, Ca, Mg, and a disordered hydrated iron oxide, possibly ferrihydrite 5Fe2, O3. 9H2O or feroxyhyte δ′-FeOOH. Whether the dark component is an irregular mixed-layer hybrid mineral or a layered accumulation resulting from epitaxy of the above phases is uncertain.

Type
Articles
Information
Geological Magazine , Volume 121 , Issue 5 , September 1984 , pp. 483 - 488
Copyright
Copyright © Cambridge University Press 1984

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