76 



Fe 2 3 



FeO 



MnO.. .. 

 Ni 8 0.... 



CoO 



A1 2 3 .... 



Si0 2 



P 2 5 



s 



Ti0 2 



V 2 5 



MgO 



BaO 



CaO 



Na 2 0.. . . 



K 2 



Moisture. 



39 



27 



21 



73 





37 





27 





07 



4 



6i 



10 



77 





02 





II 



13 



52 





52 



2 



34 





07 



4 



84 





31 





24 



•44 



Total 99*50 



Under the microscope this ore is seen to consist 

 essentially of titaniferous magnetite and pyroxene. The 

 pyroxene individuals are enclosed in the titaniferous 

 magnetite, but about each individual of pyroxene there is a 

 narrow border of brown and usually highly pleochroic 

 hornblende. The structure is well shown in the accompany- 

 ing microphotograph. 



The party will then visit an interesting occurrence of 

 nepheline syenite which appears on lot 32 of Con. Ill, 

 Glamorgan township. This nepheline syenite, which is 

 exposed on the road, is very fresh and represents a variety 

 which is very distinctly foliated and dark in colour. 

 Nepheline and hornblende preponderate largely in the 

 rock, the feldspar being subordinate in amount. The 

 hornblende has the optical properties of hastingsite and the 

 feldspar is albite. The rock also contains some grains of 

 calcite, rounded in form and occurring as inclusions in the 

 other constituents of the rock. They are clearly not of 

 secondary origin but are similar in character to those found 

 in the nepheline syenites in other parts of the area as 

 already described (see pp. 58-62). 



An anlaysis of the rock by M. F. Connor of the 

 Department of Mines is given en page 96). 



