pitchblende
noun
                                                                                                                            
                                                            pitch·blende
                    
                                                                                                              
                                                                                                                                  ˈpich-ˌblend  
                                                      
                                                          
            
                                
              
          
                                                      : a brown to black mineral that consists of massive uraninite, has a distinctive luster, contains radium, and is the chief ore-mineral source of uranium                                      
                
                    
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