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Formation of Sepiolite-Palygorskite and Related Minerals from Solution

Published online by Cambridge University Press:  01 January 2024

Rezan Birsoy
Rezan Birsoy*
Affiliation:
Dokuz Eylül University, Engineering Faculty Geology Department, 35100 Bornova, İzmir, Turkey
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Most of the world's sepiolite-palyg orskite precipitates in lacustrine and perimarine environments. Although these minerals can transform from precursor minerals, the most common formation mechanism involves crystallization from solution. In this study, equilibrium activity diagrams are calculated for sepiolite-palygorskite in the seven component system MgO-CaO-Al2O3-SiO2-H2O-CO2-HCl, employing available thermodynamic data for related minerals, aqueous species and water. Stability fields are illustrated graphically on plots of log [aMg2+/(aH+)2]vs. log [aH4SiO4o], using the activities for log [aAl3+/(aH+)3] defined by an arbitrarily chosen value and the approximate saturation limits of pyrophyllite + amorphous silica, kaolinite + amorphous silica, kaolinite + pyrophyllite, pyrophyllite + quartz and gibbsite. The formation of sepiolite-palygorskite from solution is more favored in the presence of amorphous silica than quartz. Lower aqueous aluminum activities favor the non-aluminum phases sepiolite and kerolite relative to the aluminum-containing phases palygorskite and saponite. The stability ranges of worldwide associations of magnesite and dolomite with sepiolite and palygorskite are also illustrated as a function of aluminum activity.

Keywords

Activity DiagramsClaysKerolitePalygorskiteSaponiteSepioliteSolution
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 6 , December 2002 , pp. 736 - 745
Copyright
Copyright © 2002, The Clay Minerals Society

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