42 ROYAL SOCIETY OF CANADA 



may be. The cancrinite has the appearance of being an alteration pro- 

 duct of the nepheline. 



Calcite occurs in large single individuals, which are found as in- 

 clusions in both the hornblende and the nepheline. The single in- 

 dividuals are often perfectly circular in outline, and the enclosing mineral 

 is perfectly fresh and unaltered and is sharply defined against them. In 

 other cases tlie same large calcite individuals lie between the other con- 

 stituents of the rock, in all cases having the character of inclusions. 

 They generally show very marked strain shadows, while the other con- 

 Btituents show but little or no evidence of pressure phenomena. 



The apatite is found as occasional more or less rounded individuals, 

 enclosed in the nepheline or hornblende, but, like the other accessory 

 constituents, merits no special description. 



An analysis of the rock made Mr. M. F. Connor, B.Sc, gave the 

 following results : — 



SiO^ 39.74 



TiO^ .13 



AlA 30.59 



¥e^0., .44 



FeO 2.19 



MnO .03 



CaO 5.75 



MgO .60 



K^O 3.88 



NaoO 13.25 



COo 2.17 



SO3 trace 



CI .02 



S .07 



H,0 1.00 



99.86 



If following the methods of the Quantitative Classification, the norm 

 of the rock be calculated, that is to say the proportion of standard 

 minerals which would give a magma of this composition, or in the form 

 of which the rock under other conditions of cooling might have solidified, 

 this is found to be as follows : — 



