chalcocite
noun
                                                                                                                            
                                                            chal·co·cite
                    
                                                                                                              
                                                                                                                                  ˈkal-kə-ˌsīt 
                                                      
                                                          
            
                                
              
          
                                                      : a black or gray lustrous metallic mineral that consists of a sulfide of copper and is an important copper ore                                      
                
                    
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  Merriam-Webster unabridged




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