limestone
noun
                                                                                                                            
                                                            lime·stone
                    
                                                                                                              
                                                                                                                                  ˈlīm-ˌstōn  
                                                      
                                                          
            
                                
              
          
                                                      : a rock that is formed chiefly by accumulation of organic remains (such as shells or coral), consists mainly of calcium carbonate, is extensively used in building, and yields lime when burned                                      
                
                    
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  Merriam-Webster unabridged




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