variants  
 or spinelle
        
    1
                    
                                          
              
          
                                                      : a hard crystalline mineral consisting of an oxide of magnesium and aluminum that varies from colorless to ruby red to black and is used as a gem                                      
                
                    
2
                    
                                          
              
          
                                                      : any of a group of minerals that are essentially oxides of magnesium, ferrous iron, zinc, or manganese                                      
                
                    
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  Merriam-Webster unabridged




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