Become a Member


Mars Compositions



Martian Soil Compositions (from Pathfinder 1997) by weight percentage
Element or Compound A-2, Soil A-4, Soil A-5, Soil A-3, Rock (Barnacle Bill) A-7, Rock (Yogi)
C (Carbon)* - - - - -
O (Oxygen)* ** 42.5 43.9 43.2 45.0 44.6
Na (Sodium) 3.2 3.8 2.6 3.1 1.9
Mg (Magnesium) 5.3 5.5 5.2 1.9 3.8
Al (Aluminum) 4.2 5.5 5.4 6.6 6.0
Si (Silicon) 21.6 20.2 20.5 25.7 23.8
P (Phosphorus) - 1.5 1.0 0.9 0.9
S (Sulfur) 1.7 2.5 2.2 0.9 1.7
Cl (Chlorine) - 0.6 0.6 0.5 0.6
K (Potassium)*** 0.5 0.6 0.6 1.2 0.9
Ca (Calcium) 4.5 3.4 3.8 3.3 4.2
Ti (Titanium) 0.6 0.7 0.4 0.4 0.5
Cr (Chromium) 0.2 0.3 0.3 0.1 -
Mn (Manganese) 0.4 0.4 0.5 0.7 0.4
Fe (Iron) 15.2 11.2 13.6 9.9 10.7
Ni (Nickel) - - 0.1 - -
Na2O (Sodium Oxide) 4.3 5.1 3.6 4.2 2.5
MgO (Magnesium Oxide) 8.7 9.0 8.6 3.1 6.3
Al2O3 (Aluminum Oxide) 8.0 10.4 10.1 12.4 11.4
SiO2 (Silicon Dioxide) 46.1 43.3 43.8 55.0 50.9
SO3 (Sulfur Trioxide) 4.3 6.2 5.4 2.2 4.2
K2O (Potassium Dioxide) 0.6 0.7 0.7 1.4 1.1
CaO (Calcium Oxide) 6.3 4.8 5.3 4.6 5.8
TiO2 (Titanium(IV) Dioxide) 1.1 1.1 0.7 0.7 0.8
MnO (Manganese(II) Oxide) 0.5 0.5 0.6 0.9 0.5
Ti (Titanium) 0.6 0.7 0.4 0.4 0.5
Cr (Chromium) 0.2 0.3 0.3 0.1 -
Mn (Manganese)*** 0.4 0.4 0.5 0.7 0.4
Fe (Iron) 15.2 11.2 13.6 9.9 10.7
Ni (Nickel) - - 0.1 - -
Na2O (Sodium Oxide) 4.3 5.1 3.6 4.2 2.5
MgO (Mangnesium Oxide) 8.7 9.0 8.6 3.1 6.3
Al2O3 (Aluminum Oxide) 8.0 10.4 10.1 12.4 11.4
SiO2 (Silicon Dioxide) 46.1 43.3 43.8 55.0 50.9
SO3 (Sulfur Trioxide) 4.3 6.2 5.4 2.2 4.2
K2O (Potassium Oxide) 0.6 0.7 0.7 1.4 1.1
CaO (Calcium Oxide) 6.3 4.8 5.3 4.6 5.8
TiO2 (Titanium(IV) Oxide) 1.1 1.1 0.7 0.7 0.8
FeO (Iron(II) Oxide) 19.5 14.5 17.5 12.7 13.8


Notes:
* Direct results on C and O will be available from the analysis of alpha spectra at a later date.
** O is calculated from oxide stoichiometry, assuming S in the form of SO3 and Fe in the form of FeO.
*** Values for K and Mn are upper limits; more accurate numbers will be available after further analysis.

Analysis based on X-ray data.
Values for potassium and manganese are upper limits; more accurate numbers will be available after further analysis.
Minor elements such as phosphorus, chlorine and chromium are omitted from this table.

Martian Atmospheric Composition

Element or Compound

Make-up
CO2 (Carbon Dioxide) 95.23%
N2 (Nitrogen) 2.7%
Ar (Argon) 1.6%
O2 0.13%
CO (Carbon Monoxide) 0.08%
H2O (water) 210 ppm* (0.021%)
NO (Nitrogen Oxide) 100 ppm (0.01%)
Ne (Neon) 2.5 ppm (0.00025%)
HDO (Hydrogen-Deuterium-Oxygen) 0.85 ppm (0.000085%)
Kr (Krypton) 0.3 ppm (0.00003%)
Xe (Xenon) 0.08% (0.000008%)
* = Parts-per-million

Sources:
http://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html
http://nssdc.gsfc.nasa.gov/planetary/marspath/apxs_table1.html
http://nssdc.gsfc.nasa.gov/planetary/marspath_results.html


compiled by Jim Keener