U. 8. GEOLOGICAL SURVEY 



BULLETIN 53S PLATF 



A. FERBERITE INCLOSING FINELY BRECCIATED GRANITE. 

 From Rogers tract, Nederland, Colo. Natural size. 



B. "PEANUT ORE," FERBERITE INCLOSING FINELY BRECCIATED PEGMATITE. 

 From the Conger mine, Nederland, Colo. Natural size. 



