Plate 22 



Photomicrograph of no. 77. A hornblende-plagioclasie-gneiss (probably Grenville invaded by 

 Pochuck diorite). Taken with plain light, magnification about 30 diameters. 



Showing: a Pyroxene with strong green hornblende border (dark grains with cleavage), 

 b Plagioclase feldspar field (light gray) . c Biotite (smaller flakes and dark smooth mineral) . 

 d Magnetite (black granules) . e Apatite (high relief small light crystals) . 



Plate 23 



Photomicrograph of no. 55. Hornblende-plagioclase-gneiss (Pochuck).. Taken with crossed 

 nicols, magnification about 30 diameters. 



Showing: a Abundant hornblende (dark and rough), b Abundant plagioclase (banded). 

 c A little quartz (clear grains), d A little biotite (dark flakes). 



