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Terminations of multiple-chain lamellae in grunerite asbestos

Published online by Cambridge University Press:  05 July 2018

E. J. W. Whittaker ,
B. A. Cressey  and
J. L. Hutchison
E. J. W. Whittaker
Affiliation:
Department of Geology and Mineralogy, Parks Road, Oxford OXI 3PR
B. A. Cressey
Affiliation:
Department of Geology and Mineralogy, Parks Road, Oxford OXI 3PR
J. L. Hutchison
Affiliation:
Department of Metallurgy and Science of Materials, Parks Road, Oxford OXI 3PR
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Abstract

Grunerite asbestos (var. amosite) from Penge, Transvaal, contains lamellae consisting of multiple-chain I-beams which frequently terminate within the structure. Such terminations may be either coherent or incoherent, the latter involving disturbances of the structure akin to dislocations. These may be of the nature of edge dislocations or of dislocations having both edge and screw components.

Models are presented which have been used to elucidate the structural disturbances associated with the termination and side-stepping of multiple-chain lamellae. Odd-multiple-chains are shown to be of particular significance in giving rise to dislocations with a screw component along the c-axis.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 333 , March 1981 , pp. 27 - 35
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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References

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