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Further Observations on the Morphology of Chrysotile and Halloysite

Published online by Cambridge University Press:  01 January 2024

Thomas F. Bates  and
Joseph J. Comer
Thomas F. Bates
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania, USA
Joseph J. Comer
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania, USA
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Abstract

Electron microscope studies of chrysotile show that tubes are present in bulk specimens and that these tubes commonly have fuzzy, amorphous-looking material on both the inside and outside. Similar material is associated with synthetic chrysotile and has been noted previously in halloysite specimens. The existence of such material between and within the tubes, together with apparent irregularities in size, shape and packing of tubes, explains the apparent discrepancy between the measured density of bulk samples and the calculated density of a hypothetical sample consisting of close-packed, regular, hollow capillaries.

Replicas of fractured surfaces of halloysite (2H2O) from various localities reveal that the particles occur as curved to flat laths commonly possessing “hexagonal” terminations and surface features indicative of a higher degree of crystallinity than tubes of halloysite (4H2O).

It is suggested that a complete morphological series from plates through laths to tubes exists both in platy to fibrous serpentine and in kaolinite to halloysite (4H2O). In each series a number of structural varieties are to be expected between the morphologically distinct “end members.”

Type
Article
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 6 , February 1957 , pp. 237 - 248
Copyright
Copyright © Clay Minerals Society 1957

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