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Palagonites of the Red Sea: a new occurrence of hydroxysulphate

Published online by Cambridge University Press:  05 July 2018

E. Ramanaidou  and
Y. Noack
E. Ramanaidou
Affiliation:
Laboratoire de Pétrologie de la Surface, U.A. CNRS 721, 41 Avenue Recteur Pineau, 86022 Poitiers Cédex, France
Y. Noack
Affiliation:
Laboratoire de Pétrologie de la Surface, U.A. CNRS 721, 41 Avenue Recteur Pineau, 86022 Poitiers Cédex, France
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Abstract

Palagonites from the Red Sea consist of two zones: an orange palagonite which is a mixture of Mg-Al double hydroxide, Al-hydroxide and an undetermined Si-K phase, and a white palagonite, similar to motukoreaite, a Mg-Al hydroxy-sulphate-carbonate. This mineral, frequent in experimental alteration of glass by seawater, is discovered for the first time in natural palagonite. Hydroxysulphates and hydroxides are the precursors of phyllosilicates, generally found in palagonites. The very young palagonites of the Red Sea are the first link between the natural and experimental observations.

Keywords

palagoniteshydroxideshydroxysulphatesRed Sea
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 359 , March 1987 , pp. 139 - 143
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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Footnotes

*

Present address: Lab. de Geologie Dynamique et Petrologie de la Surface, Université Aix Marseille III, F-13397 Marseille Cedex 13, France.

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