ADAMS A barlow] ALKALI SYENITES OF EASTERN ONTARIO 17 



Under I is given an analysis of the sodalite from lot 25, concession XIV 

 of Dungannon, by Dr. B. J. Haxrington.^ Under II an analysis of 

 sodalite from Uimgannon by L. McI. Leigher and G. J. \^olckenni7ig.2 



SiO,. 

 AI2Ô3 

 FeO.. 

 Na/) , 

 K.O. 

 ( "a'o . . 

 CI.. 

 SO3.. 



Insoluble , 



Deducting = CI 

 Specific gravity = 



Gancrinite. — This mineral was first detected in Canada by Dr. Har-' 

 rington in tlae nepheline syenites of Mount Royal and Belœil, in the 

 Province of Quebec.^ In the nepheline syenites of Ontario, it usually 

 can only be distinguished by the assistance of the microscope. It occurs in 

 irregular grains or rude radial aggregates, whose outlines are dependent 

 on the suTTounding minerals. It is usually at least in immediate associa- 

 tion with the nepheline and sometimes forms a narrow bolder more or 

 less completely surrounding the individuals of this mineral. It also 

 occurs in cracks or fissures traversing the nepheline. Under the micros- 

 cope it is transparent, colourless, and altogether free from inclusions or 

 alteration products. Cancrinite was noticed in considerable amount 

 in the nepheline syenite where it crosses the Monck road in Faraday 

 township, and is also found in the nepheline syenite about tAvo miles east 

 of Bancroft. On lots 25, concessions XIII and XIV of Dungannori, the 

 cancrinite was found jn small irregular masses with rather ill-defined 

 boundaries, and so intimately associated with the nepheline as to be 

 separable only with extreme difficulty. The cancrinite is translucent, 

 of a pale citron-yellow colour, gradually fading on exposure to the 



' Am. Jour. Sc. Vol. XL.VIII. 1894. pp. 17 and 18. 



*Am. Jour. Sc. Vol. XLIX. 1895. pp. 465-466. 



'Tran.s. Roy. Soc. Can. Vol. I., Sect., III., 1882-83., p. 81. 



Sec. IV., 1908. 2. 



