molybdenite
noun
                                                                                                                            
                                                            mo·lyb·de·nite
                    
                                                                                                              
                                                                                                                                  mə-ˈlib-də-ˌnīt 
                                                      
                                                          
            
                                
              
          
                                                      : a metallic gray usually foliated mineral consisting of molybdenum disulfide that is a major ore of molybdenum                                      
                
                    
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  Merriam-Webster unabridged




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