Table 3 Mineral composition of the eleven Icelandic hydrothermal samples (biofilms or MATs, mud pots or MPs, active fumaroles or AFs, and inactive fumaroles or IFs), with presence/absence notation, based on X-Ray Diffraction and Fourier Transform Infrared Spectroscopy.

From: Fingerprinting molecular and isotopic biosignatures on different hydrothermal scenarios of Iceland, an acidic and sulfur-rich Mars analog

Sample

Anatase

Sulfur

Pyrite

Quartz

Hematite

Natroalunite

Kaolinite

Montmorillonite

Heulandite

Amorphous silica

MAT-54

       

 + 

 + 

 

MAT-70

          

MAT-78

 

 + 

 + 

       

MP-74

 +

 + 

 + 

   

 + 

  

 + 

MP-87

 

 + 

 + 

   

 + 

   

AF-25

 + 

    

 + 

 + 

  

 + 

AF-90

 + 

 + 

       

 + 

IF-20

 + 

  

 + 

      

IF-49

 +

   

 + 

     

IF-66

 

 + 

       

 + 

IF-74

 + 

 + 

       

 + 

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