Plate 13 



Photomicrograph of no. 430-a. Reservoir granite. Taken with plain light, magnification about 

 30 diameters. 



Taken particularly to show a prorninent feldspar area with orthoclase and soda plagioclase, a 

 small amount of quartz and biotite with very complex development of trains of zoisite particles in 

 parallel and crossing streaks following former fractures and weakness lines through all of the 

 feldspars. 



In other slides some of the rock is granulated. In this there is very little if any granulation, but 

 very prominent development of these trains of inclusions. 



Plate 14 



Photomicrograph of no. 332-a. Reservoir granite. Taken with crossed nicols, magnification 

 about 30 diameters. 



Showing large plain fresh biotites cutting and distributed through a very finely granulated 

 feldspar and quartz field. 



The principal constituent is feldspar, next in abundance biotite. The others are quartz and 

 green hornblende and epidote. 



