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Thermal Transformations of Pyrophyllite and Talc as Revealed by X-Ray and Electron Diffraction Studies

Published online by Cambridge University Press:  01 January 2024

M. Nakahira  and
T. Kato
M. Nakahira
Affiliation:
Pennsylvania State University, University Park, Pa., USA University of Tokyo, Hongo, Tokyo, Japan
T. Kato
Affiliation:
Pennsylvania State University, University Park, Pa., USA
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Abstract

Single crystal X-ray and electron diffraction studies were carried out to examine the thermal transformation sequences of pyrophyllite and talc, respectively. The results showed that both minerals transformed topotactically. No dehydroxylated talc phase was observed, while an anhydride of pyrophyllite was obtained at about 900°C. The presence of a distorted anhydride lattice of pyrophyllite tends to indicate a homogeneous mechanism for the dehydroxylation of pyrophyllite. In contrast, the diffraction features of heated talc together with the cell volume relationship between talc and enstatite suggest an inhomogeneous mechanism for this reaction.

Type
Symposium on High Temperature Transformations
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 12 , February 1963 , pp. 21 - 27
Copyright
Copyright © The Clay Minerals Society 1963

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Footnotes

Contribution No. 63-53, College of Mineral Industries, The Pennsylvania State University, University Park, Pennsylvania.

References

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