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Halloysite Formation Through In Situ Weathering of Volcanic Glass from Trachytic Pumices, Vico's Volcano, Italy

Published online by Cambridge University Press:  09 July 2018

P. Quantin ,
J. Gautheyrou  and
P. Lorenzoni
P. Quantin
Affiliation:
ORSTOM, 70 route d'Aulnay, 93143 Bondy Cedex, France
J. Gautheyrou
Affiliation:
ORSTOM, 70 route d'Aulnay, 93143 Bondy Cedex, France
P. Lorenzoni
Affiliation:
ISSDS, Piazza d'Azeglio 30, Firenze, Italy
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Abstract

The weathering of a trachytic pumice within a pyroclastic flow underlying an andic-brown soil on the volcano Vico has been studied. The main mineral formed is a spherical 10 Å halloysite which has been shown by SEM and in situ microprobe analysis to have formed directly from the glass. The major mineralogical characteristics as determined by XRD, IR, DTA, TEM and microdiffraction are typical of 10 Å halloysite. However, some minor mineralogical properties and the high Fe and K contents, suggest that it is an interstratification of 74% halloysite and 26% illite-smectite. The calculated formula of the hypothetical 2:1 minerals reveals an Fe- and K-rich clay, with high tetrahedral substitution, like an Fe-rich vermiculite, but the detailed structure of this mineral remains uncertain.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 4 , December 1988 , pp. 423 - 437
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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