U. a. GEOLOGICAL SURVEY 



BULLETIN 683 PLATE XIII 



A. HUBNERITE FROM THE DRAGOON MOUNTAINS, ARIZ. 

 Section showing zonal structure. X 5. 





B. PHOTOMICROGRAPH OF GRANITE FROM WHETSTONE MOUNTAINS, ARIZ. 

 Showing wolframite (black) with warty protuberances of scheelite. X 90. 



