[HOWARD] SOME OUTLIERS OF THE MONTEREGIAN HILLS 61 



Chemical Analysis of Monticellite Alnoite, Como, Que. 

 Analysis by W. V. Howard 



Norm 



SiOa 30.27 



AI2O3 10.00 



FezOs 4.88 



FeO 6.95 



MgO 20.11 



CaO 14.73 



NasO 1.49 



K2O 2.85 



H2O 2.17 



Ti02 2.84 



MnO 0.16 COo equivalent to 7.40% CaCO 3 



P2O5 0.95 



CO2 3.24 



100.64 



Classification 

 Dofemane 

 dopolic (Scotare) 

 perolic 

 domiric 

 domagnesic 

 Spec. grav. 3.04 IV. 2. 5. 2."2 



Monchiquite Sheet, Ste. Monique 



At Ste. Monique, two miles north of St. Augustin Station, on 

 the Canadian Pacific Railway, North Shore Line between Montreal 

 and Ottawa, there are several outcrops of rocks similar in appearance 

 to the alnoites at Isle Cadieux and Como. These exposures extend 

 over an area about two miles long and half a mile wide ; the southern 

 exposure is situated on the west side of the road from Ste. Monique 

 to St. Augustin Station about half a mile south of Ste. Monique, 

 while the northernmost one lies a quarter of a mile east of the road 

 to St. Jerome, and a mile and a half north of Ste. Monique. 



Starting at the northern exposure, the following rock types are 

 noted: The northernmost exposure forms the northern slope of a 

 small hill and is 400 yards in length from east to west, by 100 yards 

 in width. This is composed of a dark grey, fine-grained rock with 

 coarse biotite grains up to 6 mm. in diameter. This locality is partie- 



