GEOLOGY OF MOUNT MARCY 6l 



Labradorite is universal in the anorthosite. When crushing and 

 granulation have not destroyed the larger crystals, beautifully stri-. 

 ated cleavage fragments may be obtained. Occasionally the char- 

 acteristic play of colors may be seen. 



Magnetite in massive form may be found in the dumps ot che 

 old Weston mine, and at the other small openings. No well-defined 

 crystals have been met. 



Orthoclase, besides being a constituent of the syenites, appears in 

 an occasional pegmatite vein. One such vein was observed by C. H. 

 Fulton on the summit of Mount Porter. 



Wollastonite of pearly, fibrous character was opened by blasting a 

 ledge in 1909 in road improvements on the east side of the East 

 brancTi about one-fourth of a mile south of the edge of the sheet. 

 It was a component of a small contact zone apparently produced by 

 syenite on Grenville limestone. The amount was not large. 



