JV. L. Bowen — The Composition of Nephelite. 51 



Fig. 1. 



&&% Na a 0AI 2 O 3 



./- Kal'iophilii© 

 «5% K^OAl^q, 



1. Hintze, analysis 23. 



2. Foote and Bradley, this Journal, xxxi, 25, 1911. 



3. 7, 8 and 9. Morozewicz, Bull. Acad. Sci., Cracovie, 958, 1907. 

 6. Adams and Barlow, Mem. No. 6, Geol. Surv. Can., p. 236. 



10. Hintze, analysis 34. 



certainly would not have been silica, for the evidence from 

 nature is that silica and nephelite do not occur together. 

 The only other possibility is a compound of the type Na 2 

 Al 2 3 2+wSi0 2 , of which the most likely is albite, again from 

 evidence in nature. 



