covellite
noun
                                                                                                                            
                                                            co·vel·lite
                    
                                                                                                              
                                                                                                                                  kō-ˈve-ˌlīt  
                                                                                                                              
            ˈkō-və-
                                                      
                                                          
            variants  
 or less commonly covelline    
    
                                                        kō-ˈve-ˌlēn  
                                                    
        ˈkō-və-
            
                                
              
          
                                                      : a usually blue mineral consisting of a sulfide of copper                                      
                
                    
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  Merriam-Webster unabridged




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