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On Pyroxene Molecules in the CIPW Norm

Published online by Cambridge University Press:  01 May 2009

F. Chayes
F. Chayes
Affiliation:
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C.
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Abstract

Barth argued that the CIPW conventions governing the calculation of normative pyroxenes and olivines are based upon inadequate or incorrect mineralogical information and should be abandoned. The real occasion for the conventions appears to be petrological, not mineralogical. Qualitative agreement between norms and modes of undersaturated rocks requires the use of these or very similar conventions. Ease of calculation is no longer a major consideration and a more realistic set of rules could now be adopted if it were available.

Information

Type
Articles
Information
Geological Magazine , Volume 100 , Issue 1 , February 1963 , pp. 7 - 10
Copyright
Copyright © Cambridge University Press 1963

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References

REFERENCES

Barth, T. F. W., 1931. Proposed change in calculation of norms of rocks. Mineral. u. petrog. Mitt., 42, 1–7.Google Scholar
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