Globular Cluster Microstructure of Endellite (Hydrated Halloysite) from Bedford, Indiana

Sidney Diamond and James W. Bloor
School of Civil Engineering, Purdue University, Lafayette, Indiana 47907, U.S.A.
Department of Civil Engineering, The University of Calgary, Calgary, Alberta, Canada

Abstract: Scanning electron microscope observation of endellite from Bedford, Indiana, discloses the existence of globular clusters of quasi-tubular endellite particles radiating from common centers. Individual clusters are of the order of 10 µ in overall diameter. The individual quasi-tubular particles are irregularly flattened in cross section, and some may be plugged at the ends. Conventional oven drying at 105°C results in partial unrolling and incomplete flattening of the quasi-tubular particles of some of the clusters. The globular cluster microstructure is taken to represent the result of in-situ crystallization from solution. If this is so, these hollow tubes cannot have arisen by the mechanism of repeated extrusion of concentric zonal crystallites as postulated by Chukhrov and Zvyagin.

Clays and Clay Minerals; December 1970 v. 18; no. 6; p. 309-312; DOI: 10.1346/CCMN.1970.0180602
© 1970, The Clay Minerals Society
Clay Minerals Society (www.clays.org)