0. 8. GEOLOGICAL SURVEY 



BULLETIN 583 PLATE VII 



A. WEDGE-SHAPED FERBERITE CRYSTALS FROM THE LONE TREE MINE, NEDERLAND, 



COLO. 



Fan-shaped intergrowth in right center. Coated with ammonium chloride. X 2. 



B. WEDGE-SHAPED FERBERITE CRYSTALS FROM THE HOOSIER MINE, NEDERLAND, COLO. 

 Fan-shaped mtergrowth and twins in lower right center. Coated with ammonium chloride. X 2. 



