Plate 17 



A. Garnet reaction rim showing the labradorite (Fs) 

 with included orthoclase (Or), on the left; garnet (G) 

 in the center, succeeded by quartz (Q) and pyroxene 

 (Px) on the right. White Hght, actual field 0.08 inch 

 or 2.0 mm. 



B. Section o£ mtergrowths of pyroxene, var. heden- 

 bergite (Px), and hypersthene (Hy). Magnetite is 

 (Mg). Crossed nicols, actual field 0.08 inch or 2.0 mm. 



