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II.—On the Flame-Reaction of Potassium in Silicates

Published online by Cambridge University Press:  01 May 2009

Grenville A. J. Cole
Grenville A. J. Cole
Affiliation:
Royal College of Science for Ireland.
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Extract

When recently examining a series of igneous rocks for the Geological Survey of the United Kingdom, I required a ready method for the determination of potassium in the felspars, whether they occurred as porphyritic crystals or as microlites in the groundmass. The ordinary flame-reaction has always been recognized as unsatisfactory in the presence of sodium, and the use of blue glass has been long recommended, of a sufficient thickness to cut off a sodium flame, the potassium flame then coming through alone.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 3 , March 1898 , pp. 103 - 106
Copyright
Copyright © Cambridge University Press 1898

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References

page 104 note 1 “Ueber eine nene Methode die Feldspathe zu bestimmen,” p. 34; Budapest, 1876.Google Scholar

page 104 note 2 Cole, G., “A Simple Apparatus for Flame-Reactions”: Geol. Mag., 1888, p. 314.CrossRefGoogle Scholar