28 ROYAL SOCIETY OF CANADA 



Natrolite and Analcite. 



Though not among the constituents proper of the nepheline-syenite, 

 these minerals are occasional!}' met with at the Corporation Quarry 

 as secondary products in cavities or veins. The natrolite examined 

 occurred in aggregations of columns or prisms, closely associated with 

 analcite. It was white, translucent, and vitreous in lustre. Hardness 

 5, specific gravity 2-234. The results obtained on analysis are as 

 follows : — 



Silica 47.09 



Alumina 26.99 



Ferric Oxide tr . 



Lime tr. 



Soda 16.46 



Potash 0.01 



Water 9.80 



100.35 



The mineral gelatinized readily with hydrochloric acid, and fused 

 quietly at 2 to a blebby glass, colouring the flame strongly yellow. 



The analcite crystals examined were white trapezohedrons nearly 

 a quarter of an inch in diameter. They were vitreous in lustre and 

 sub-translucent. Hardness a little over 5, and specific gravity 2.22. 

 An analysis by Mr. J. A. E. Egleson, Demonstrator in Chemistry, gave 

 the following results: — 



Silica 54.83 



Alumina 24.20 



Lime 0.08 



Soda 12.01 



Water.... 8.50 



J)9.(i2 



McGill University, 

 May, 1905. 



