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VII.—A Method of Classifying Igneous Rocks according to their Chemical Composition

Published online by Cambridge University Press:  01 May 2009

Hugh Warth
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Extract

The chemical classification of igneous rocks is rendered difficult by the large number of substances which are present in them. H. S. Washington, who based his system of classification upon the composition of standard rock-forming minerals, found it necessary in his great work to divide his 2,880 rocks into no less than 167 final groups in order to ensure a close proximity between the rocks within each group.

Type
Original Articles
Information
Geological Magazine , Volume 3 , Issue 3 , March 1906 , pp. 131 - 135
Copyright
Copyright © Cambridge University Press 1906

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References

1 Washington, H. S., “Chemical Analyses of Igneous Rocks”; Washington Government Printing Office, 1903.Google Scholar