Chromium

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Cr 24
 
Chromium

Abundance: % (surface)

Chromium (periodic table symbol: CR, The most common stable isotope is 52Cr.

Chromium is one of the main additives to many stainless steels. It can reach 25-30% by mass of stainless steel.

Production of stainless steel on Mars would require chromium. As the cosmic abundance of chromium is fairly high, it should be available on Mars.