Plate 36 



Photomicrograph of no. 492-fo. An injected or impregnated variety of 

 Manhattan schist. Taken with crossed nicols, magnification about 25 diam- 

 eters. 



Showing verj- irregularly distributed constituents including: 



a Abundant ibiotite (foliated) 



b Abundant plagioclase feldspar (banded grains) 



c Quartz (clear grains) 



d Fibrolite (rods) 



e A very little magnetite 



