From: alex@spamblocker.com   
      
   Christopher P. Winter wrote:   
      
   >     In the infrared spectrograph trace from the Spirit rover, what do the   
   > sharp dips at about 5.5 and 12.5 micrometers mean?   
      
   I believe the "12.5" micron absorption is due to a silicate; however,   
   I'm not sure about the "5.5" micron feature.   
      
   --   
      
      
                                                   Alex R. Blackwell   
                                                   University of Hawaii   
      
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