staurolite
noun
                                                                                                                            
                                                            stau·ro·lite
                    
                                                                                                              
                                                                                                                                  ˈstȯr-ə-ˌlīt  
                                                      
                                                          
            
                                
              
          
                                                      : a mineral consisting of a basic silicate of iron and aluminum in prismatic orthorhombic crystals often twinned so as to resemble a cross                                      
                
                    
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  Merriam-Webster unabridged




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