30i 



P 2 5 1-56 0-15 1-26 



Mn 0-15 o- 10 0-23 



99-31 100-70 98-94 



Specific gravity 2-74 2-63 3-16 



1. Unhanded Colquitz quartz-diorite gneiss, Smiths 

 Hill, Victoria district. M. F. Connor, analyst. 



2. Salic facies of Colquitz gneiss, north of Prospect lake, 

 Lake district. M. F. Connor, analyst. 



3. Coarse grained facies (hornblendite) of Colquitz gneiss. 

 Northwest of Prospect lake, Lake district. M. F. Connor, 

 analyst. 



The youngest granitic rock, the Saanich granodiorite, 

 forms a stock underlying the southwestern part of Esqui- 

 malt peninsula, and other smaller stocks. It is a light 

 coloured, medium-grained rock, frequently having a some- 

 what gneissic texture and consisting essentially of feldspar, 

 orthoclase and andesine, quartz, and accessory hornblende, 

 and usually biotite. The granodiorite contains also num- 

 erous small rounded segregations, darker coloured than 

 the normal rock and consisting chiefly of plagioclase and 

 hornblende. An analysis of a rather basic phase of the 

 Saanich granodiorite is given below. 



Si 2 62 



A1 2 3 17 



Fe 2 3 1 



FeO 3 



MgO 2 



CaO 4 



Na 2 3 



K 2 2 



H 2 + 1 



Ti0 2 o 



P 2 5 o 



Mn O o 



Specific gravity , 



100-75 

 2-71 



64 



75 

 64 

 44 

 53 

 44 

 53 

 14 

 65 

 60 



25 

 14 



