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A metallographic study of the angra dos Reis (iron) meteorite

Published online by Cambridge University Press:  05 July 2018

H. J. Axon  and
C. V. Waine
H. J. Axon
Affiliation:
Metallurgy Department, The University, Manchester, M13 9PL
C. V. Waine
Affiliation:
Metallurgy Department, The University, Manchester, M13 9PL
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Summary

The Angra dos Reis (iron) has been studied metallographically and an attempt has been made to discuss the circumstances under which the following elements of structure formed: clear etching and frosty etching kamacite, decorated Neumann lines, giant rhabdites, plate rbabdites, rhabdite clusters, microrhabdites, cohenite, and remelted troilite. The remelted troilite is taken to indicate a shock event. However, since there are no metallographically visible indications of shock in the kamacite and since the back reflection X-ray diffraction pattern shows only very faint Debye-Scherrer arcs superimposed on a pattern of sharp spots, it is concluded that the shock event took place at a temperature that allowed shock effects to anneal out of the kamacite almost completely. A submicroscopic precipitate in the metallic matrix is observable with the electron microscope and may represent the final precipitation of phosphide from shocked kamacite.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 293 , March 1971 , pp. 94 - 101
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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References

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