Plate 24 



Photomicrograph of no. 



Pochuck injection product. 



30 diameters. 

 Showing : 



a Abundant plagioclase (banded) 

 b Abundant hornblende (coarse dark) 

 c Several large grains of titanite (very rough) 

 d A very little magnetite 



306. Hornblende-plagioclase-gneiss, essentially 

 Taken with crossed nicols, magnification about 



