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IV.—Pleochroic Halos

Published online by Cambridge University Press:  01 May 2009

F. P. Mennell
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Extract

The subject of ‘pleochroic halos’ has become endowed with peculiar interest since Professor Joly suggested that they are due to the radio-activity of the inclusions round which they occur. On looking into such petrographical literature as I possess, it appears that very few precise observations have been made regarding these halos, and it has occurred to me, therefore, that some of my own notes on the subject may be of general interest.

Type
Original Articles
Information
Geological Magazine , Volume 7 , Issue 1 , January 1910 , pp. 15 - 19
Copyright
Copyright © Cambridge University Press 1910

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References

page 15 note 2 Phil. Mag., 1907, p.381.

page 16 note 1 Nature of enclosed mineral somewhat doubtful.

page 17 note 1 Nature of enclosed mineral somewhat doubtful.

page 17 note 2 Radio-activity and Geology, p. 68.

page 17 note 3 See, however, Strutt, , Proc. Roy. Soc.A., 1908, p. 275.Google Scholar

page 17 note 4 See, for instance, Geol. Mag., 1903, Dec. IV, Vol. X, p. 347, and Geology of South Rhodesia, pp. 29–32.

page 18 note 1 See Minéraux des Roches, p. 288.