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Further data on the occurrence of pectolite in kimberlite

Published online by Cambridge University Press:  05 July 2018

Barbara H. Scott Smith ,
E. Michael Skinner  and
C. Roger Clement
Barbara H. Scott Smith
Affiliation:
Anglo American Research Laboratories, PO Box 106, Crown Mines 2025, South Africa
E. Michael Skinner
Affiliation:
Geology Department, De Beers Consolidated Mines Ltd., PO Box 47, Kimberley 8300, South Africa
C. Roger Clement
Affiliation:
Geology Department, De Beers Consolidated Mines Ltd., PO Box 47, Kimberley 8300, South Africa
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Abstract

Pectolite has been identified, using petrographic, chemical, and X-ray methods, in kimberlites from the De Beers and Dutoitspan Mines, Kimberley, South Africa and the Letseng-La-Terai Mine, Lesotho. It occurs as radiating aggregates of fibrous or acicular crystals not only in the groundmass of certain kimberlites but also in altered xenoliths included within kimberlite. The occurrence of Na-rich minerals in kimberlite is unusual. It is suggested that it can occur as an apparently primary mineral resulting from the incorporation and assimilation of foreign Na-bearing material prior to final consolidation, and/or as a secondary mineral after metasomatic introduction of Na-bearing fluids.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 342 , March 1983 , pp. 75 - 78
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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Footnotes

*

Present address: 670 Montroyal Boulevard, Vancouver V7R 2G3, Canada.

References

Clement, C.R., and Skinner, E.M.W. (1979) Chairman's Summaries and Poster Session Abstracts—-Kimberlite Symposium II, Cambridge, July 1979, 18–21.Google Scholar
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Kruger, F.J. (1982) Ibid. 46, 274–5.Google Scholar
Neumann, H., and Bergstol, S. JCPDS Card No. 16–695.Google Scholar
Skinner, E. M. W., and Clement, C.R. (1979) Proceedings of the Second International Kimberlite Conference, Vol. 1, Am. Geophys. Union. Washington, 120–39.Google Scholar