anthracite
noun
                                                                                                                            
                                                            an·thra·cite
                    
                                                                                                              
                                                                                                                                  ˈan(t)-thrə-ˌsīt 
                                                      
                                                          
            
                                
              
          
                                                      : a hard natural coal of high luster differing from bituminous coal in containing little volatile matter and in burning very cleanly                                      
                
called also hard coal
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  Merriam-Webster unabridged




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