Section III., 1905. 



[25] 



Trans. R. S. C. 



III. — On the Composition of some Montreal Minerals. 



By B. J. Harrington, M.A., LL.D. 



(Read May 24, 1905.) 



Though the nepheline-syenites of jMontreal have been made the 

 subject of considerable study no quantitative analyses of their constitu- 

 ent minerals have hitherto been published. The present paper gives 

 the results of some recent studies which, it is hoped, will shortly be 

 followed by others. 



Nepheline. 



The material for the following analysis was derived from one of 

 the segregated veins in the nepheline-syenite of the Corporation Quarry ^ 

 at the back of ]\Iount Eoyal. Great care was taken to separate it from 

 the associated minerals and the microscope showed that with the excep- 

 tion of some very minute inclusions it was free from admixed substances. 

 The nepheline analysed was of a pale flesh-red colour, translucent and 

 vitreous to slightly greasy an lustre. It showed no marked cleavage, 

 but sub-conchoidal to uneven fracture'; with hydrochloric acid gela- 

 tinised readily, and before the blow-pipe fused quietly at about 3.5 to 

 a vesicular glass. The percentage composition is given under I. and, 

 for the sake of comparison, other analyses are included under II., III. 

 and IV. :— 



Anal, by the writer. Am. 



^ Sometimes known as Forsyth's Quarry. 

 " From nepheline-syenite of Dungannon, Ont. 

 Jour, of Sc. July, 1894. 



' Litchfield, Me- Anal, by F. W. Clarke. Am. Jour. Sc, 1886 



* Fredriksvarn, Norway, Anal, by Lemberg. Zs. G. Ges., 1876. 



