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Palygorskite from Warren Quarry, Enderby, Leicestershire, England

Published online by Cambridge University Press:  09 July 2018

Pei-Lin Tien
Pei-Lin Tien*
Affiliation:
Department of Geology, East Carolina University, Greenville, North Carolina, U.S.A. 27834
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Abstract

Specimens of palygorskite from Warren Quarry, Enderby, Leicestershire, have been studied in the laboratories. The mineral is found in dioritic rocks in association with angular dolomitic rock fragments as the filling material of a joint, the walls of which are sometimes lined with calcite and dolomite. Palygorskite occurs as 3-10 mm long bundles of fibres, 0·03-0·1 μm wide. X-ray diffraction data indicate that the mineral may occur in the monoclinic form. The structural formula for the half-unit cell is Si8(Al1.89Fe0.053+Ti0.01Mg1.99)O20(OH)2(OH2)4 3·61 H2O.Ca0.07. Data obtained from differential thermal and infrared analyses are comparable with those for palygorskite in the literature, but the six-sided transversal cross-section of the fibres as revealed by electron microscopy is unexpected. The mineral was formed after the deposition of the overlying basal Triassic rocks when ground waters penetrated cracks in the dioritic rocks, causing Si and Mg to be released there and above the unconformity.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 1 , July 1973 , pp. 27 - 34
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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