[ADAMS A barlow] ALKALI SYENITES OF EASTERN ONTARIO 



39 



An analysis of the rock by Prof. Norton-Evans shows it to have 

 the following chemical composition : — 



SiOo. 



TiO^. 



Al,03 



Fe,03 



FeO . , 



MnO. 



CaO. 



MgO. 



K^O. 



Na.O, 



PÀ- 



H,0. 



J Is norm is as follows: 



Ortlioclase. . . . 



Albite 



Anorthite. . . . 

 Nepheline .... 

 Diopside. . . . 



Olivine 



Ilmenite . . . . 

 Magnetite. . . . 



Apatite 



Calcite 



Water.. . 



43.72 



.38 



25.08 



2.00 



4.36 



.16 



6.92 



.97 



2.69 



11.02 



.19 



2.99 



.88 



100.36 



15.57 



7.34 



10.80 



46.58 



3.08 



5.10 



.76 



2.78 



.34 



6.80 



99.15 



per cent. 



per cent. 



100.03 



Its position in the Quantitative Classification is: — 



Class II Dosalane (very near Persalane). 



Order 7 Ttalare. 



Rang 2 Yulturase. 



Sub-rang 4 A^ulturose. 



