Definition of Fergosonite	
	    			    		
		    		Fer"gu*son*ite (?), n. (Min.)
A mineral of a brownish black color, essentially a tantalo-
niobate of yttrium, erbium, and cerium; -- so called after Robert
Ferguson. 
  
		    		 - Webster's Unabridged Dictionary (1913) 
		    		 
		    		    			
	    			 
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