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A Further Note on Chlorophaeite and Palagonite

Published online by Cambridge University Press:  01 May 2009

L. Leigh Fermor
L. Leigh Fermor
Affiliation:
Geological Survey of, India.
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Extract

I have read with very great interest Dr. Peacock's paper on the distinction between palagonite and chlorophaeite in the GeologicalMagazine, for April, 1930. On p. 170 thereof, Dr. Peacock gives a brief summary of my conclusions upon the nomenclature of chlorophaeite and palagonite as given in my paper on the same subject. Briefly, my conclusions are that as far as can be judged from existing analyses, the hydrous glassy material forming a portion of the rocks originally called palagonite has a composition that brings it within the range of composition exhibited by various specimens of chlorophaeite, and that, therefore, the term palagonite should be reserved for the impure rock, and the term chlorophaeite used for this hydrous glassy material. It was also recommended by me that the process by which in the case of the basaltic tuffs the primary glass becomes hydrated should be termed palagonitization and that the same term should be applied to the process by which the interstitial glass of basaltic lava flows is altered with production of chlorophaeite. The fact that olivine, if present, a portion of the augite, and occasionally some of the felspar, may also suffer similar alteration or be replaced, is not regarded by me as pointing to an essential difference in the two processes.

Type
Original Articles
Information
Geological Magazine , Volume 68 , Issue 6 , June 1931 , pp. 266 - 274
Copyright
Copyright © Cambridge University Press 1931

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References

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page 267 note 2 But it must be noted that a reference to Heddle's original paper(Trans. Roy. Soc. Edinb., xxix, 86) shows that of the material selected for analysis, one-fifth was green in colour and none had changed further than to a rich asphalt-brown.

page 267 note 3 But is must be noted that according to Heddle(Ibid.., 88) the material used for analysis VII was a deep rich brown in colour.

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