COMPOSITION OF EXTRATERRESTRIAL SOILS (approx)
=====================================

MARS
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SiO2    44  %
Al2O3    7  %
Fe2O3   17  %
MgO      6  %
CaO      6  %
K2O      0  %
TiO2     0.7%
SO3      6  %
Cl       0.8%




As usual, no guarentees are made as to the accuracy or obsolescence of this information.  Use at your own risk.