| 
                Compounds | Reactions | Production 
             | 
         
| Iridium Compounds | 
| Osmiridium | 
 Osmiridium IrOs
             | 
         
| An alloy of osmium and iridium, with traces of other platinum group metals, found naturally or man-made. | 
| Osmiridium is used in making fountain pen nibs, surgical equipment, and other high-wear functions. |