novaculite
noun
                                                                                                                            
                                                            no·vac·u·lite
                    
                                                                                                              
                                                                                                                                  nō-ˈva-kyə-ˌlīt  
                                                      
                                                          
            
                                
              
          
                                                      : a very hard fine-grained siliceous rock used for whetstones and possibly of sedimentary origin                                      
                
                    
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  Merriam-Webster unabridged




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