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On some unusual twin-laws observed in the orthoclase crystals from Goodsprings, Nevada

Published online by Cambridge University Press:  14 March 2018

Julien Drugman
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Extract

The very abundant literature dealing with the twinning of felspar phenocrysts has put on record a surprisingly large number of twin-laws. Some of these have such complex indices that they have never been accepted; others are regarded as doubtful. Yet the authors of these have well-established reputations and the accuracy of their observations cannot be doubted. The difficulty lies in the interpretation of the results. Beside numerous examples of well-defined laws, one comes across a high percentage of isolated cases, each appearing quite as plausible as these, yet difficult to assign to any definite law.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 25 , Issue 160 , March 1938 , pp. 1 - 14
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1938

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References

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