Table 1: Derived modal mineralogy of the studied phyllosilicate-rich outcrops. Values are percent and are rounded to 5%. The abbreviated names of minerals are: Nont: Nontronite, Mont: Montmorillonite, Kaol: Kaolinite, Ferri: Ferrihydrite, Pump: Pumpellyite, Hi: Hisingerite, Plag: Plagioclase, Pyr: Pyroxene.

Spot		 Location1 Nont Mont Kaol Ferri Smectite2 Pump Mg-Saponite Hi Illite Plag Dust Pyr rms
  Mawrth Vallis                          
MV1 341.64, 21.90 50 - - 15 - - - - - 20 13 - 0.0031
MV2 342.45, 23.24 65 - - 10 - - - - - 15 10 - 0.0028
MV3 341.48, 23.03 20 - - 20 - - - - - 30 30 - 0.0019
MV4 341.22, 24.08 40 - - 20 - - - - - 25 10 - 0.0026
MV5 341.05, 24.74 40 - - 20 - - - - - 30 5 - 0.0020
MV6 340.83, 26.50 50 - - 15 - - - - - 20 15 - 0.0027
MV7 338.80, 24.59 - 20 20 25 - - - - - 25 5 - 0.0029
MV8 338.87, 24.39 55 - - 10 - - - - - 25 5 5 0.0021
MV9 338.80, 24.30 25 - - 20 - - - - - 35 5 15 0.0019
MV10 338.80, 24.44 50 - - 5 - - - - 15 20 10 - 0.0023
  Nili Fossae                          
NF1 73.08, 19.54 20 - - - - - - - - 50 10 20 0.0027
NF2 73.40, 23.04 5 - - 30 - - - - - 45 - 20 0.0020
NF3 71.83, 17.10 - - - - 15 20 - - - 40 15 20 0.0026
  Other deposits                          
O1 354.53, -5.02 - - - 15 - - 15 - - 50 - 20 0.0024
O2 305.52, 18.80 - 5 - 20 - - 20 - - 35 5 15 0.0027
O3 90.46, -4.32 - - - 10 - - - 35 - 35 5 15 0.0023
O4 202.25, -30.62 - 15 10 - - - - - - 45 5 25 0.0027

1 Longitude ($^\circ$E), Latitude ($^\circ$N); 2 Al/Mg/Fe-bearing smectite.


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